diff --git a/src/google/protobuf/duration.pb.cc b/src/google/protobuf/duration.pb.cc
new file mode 100644
index 0000000..b325944
--- /dev/null
+++ b/src/google/protobuf/duration.pb.cc
@@ -0,0 +1,408 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: google/protobuf/duration.proto
+
+#define INTERNAL_SUPPRESS_PROTOBUF_FIELD_DEPRECATION
+#include <google/protobuf/duration.pb.h>
+
+#include <algorithm>
+
+#include <google/protobuf/stubs/common.h>
+#include <google/protobuf/stubs/port.h>
+#include <google/protobuf/stubs/once.h>
+#include <google/protobuf/io/coded_stream.h>
+#include <google/protobuf/wire_format_lite_inl.h>
+#include <google/protobuf/descriptor.h>
+#include <google/protobuf/generated_message_reflection.h>
+#include <google/protobuf/reflection_ops.h>
+#include <google/protobuf/wire_format.h>
+// @@protoc_insertion_point(includes)
+
+namespace google {
+namespace protobuf {
+
+namespace {
+
+const ::google::protobuf::Descriptor* Duration_descriptor_ = NULL;
+const ::google::protobuf::internal::GeneratedMessageReflection*
+  Duration_reflection_ = NULL;
+
+}  // namespace
+
+
+void protobuf_AssignDesc_google_2fprotobuf_2fduration_2eproto() {
+  protobuf_AddDesc_google_2fprotobuf_2fduration_2eproto();
+  const ::google::protobuf::FileDescriptor* file =
+    ::google::protobuf::DescriptorPool::generated_pool()->FindFileByName(
+      "google/protobuf/duration.proto");
+  GOOGLE_CHECK(file != NULL);
+  Duration_descriptor_ = file->message_type(0);
+  static const int Duration_offsets_[2] = {
+    GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Duration, seconds_),
+    GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Duration, nanos_),
+  };
+  Duration_reflection_ =
+    ::google::protobuf::internal::GeneratedMessageReflection::NewGeneratedMessageReflection(
+      Duration_descriptor_,
+      Duration::default_instance_,
+      Duration_offsets_,
+      -1,
+      -1,
+      -1,
+      sizeof(Duration),
+      GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Duration, _internal_metadata_),
+      GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Duration, _is_default_instance_));
+}
+
+namespace {
+
+GOOGLE_PROTOBUF_DECLARE_ONCE(protobuf_AssignDescriptors_once_);
+inline void protobuf_AssignDescriptorsOnce() {
+  ::google::protobuf::GoogleOnceInit(&protobuf_AssignDescriptors_once_,
+                 &protobuf_AssignDesc_google_2fprotobuf_2fduration_2eproto);
+}
+
+void protobuf_RegisterTypes(const ::std::string&) {
+  protobuf_AssignDescriptorsOnce();
+  ::google::protobuf::MessageFactory::InternalRegisterGeneratedMessage(
+      Duration_descriptor_, &Duration::default_instance());
+}
+
+}  // namespace
+
+void protobuf_ShutdownFile_google_2fprotobuf_2fduration_2eproto() {
+  delete Duration::default_instance_;
+  delete Duration_reflection_;
+}
+
+void protobuf_AddDesc_google_2fprotobuf_2fduration_2eproto() {
+  static bool already_here = false;
+  if (already_here) return;
+  already_here = true;
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  ::google::protobuf::DescriptorPool::InternalAddGeneratedFile(
+    "\n\036google/protobuf/duration.proto\022\017google"
+    ".protobuf\"*\n\010Duration\022\017\n\007seconds\030\001 \001(\003\022\r"
+    "\n\005nanos\030\002 \001(\005BP\n\023com.google.protobufB\rDu"
+    "rationProtoP\001\240\001\001\242\002\003GPB\252\002\036Google.Protobuf"
+    ".WellKnownTypesb\006proto3", 183);
+  ::google::protobuf::MessageFactory::InternalRegisterGeneratedFile(
+    "google/protobuf/duration.proto", &protobuf_RegisterTypes);
+  Duration::default_instance_ = new Duration();
+  Duration::default_instance_->InitAsDefaultInstance();
+  ::google::protobuf::internal::OnShutdown(&protobuf_ShutdownFile_google_2fprotobuf_2fduration_2eproto);
+}
+
+// Force AddDescriptors() to be called at static initialization time.
+struct StaticDescriptorInitializer_google_2fprotobuf_2fduration_2eproto {
+  StaticDescriptorInitializer_google_2fprotobuf_2fduration_2eproto() {
+    protobuf_AddDesc_google_2fprotobuf_2fduration_2eproto();
+  }
+} static_descriptor_initializer_google_2fprotobuf_2fduration_2eproto_;
+
+namespace {
+
+static void MergeFromFail(int line) GOOGLE_ATTRIBUTE_COLD;
+static void MergeFromFail(int line) {
+  GOOGLE_CHECK(false) << __FILE__ << ":" << line;
+}
+
+}  // namespace
+
+
+// ===================================================================
+
+#if !defined(_MSC_VER) || _MSC_VER >= 1900
+const int Duration::kSecondsFieldNumber;
+const int Duration::kNanosFieldNumber;
+#endif  // !defined(_MSC_VER) || _MSC_VER >= 1900
+
+Duration::Duration()
+  : ::google::protobuf::Message(), _internal_metadata_(NULL) {
+  SharedCtor();
+  // @@protoc_insertion_point(constructor:google.protobuf.Duration)
+}
+
+void Duration::InitAsDefaultInstance() {
+  _is_default_instance_ = true;
+}
+
+Duration::Duration(const Duration& from)
+  : ::google::protobuf::Message(),
+    _internal_metadata_(NULL) {
+  SharedCtor();
+  MergeFrom(from);
+  // @@protoc_insertion_point(copy_constructor:google.protobuf.Duration)
+}
+
+void Duration::SharedCtor() {
+    _is_default_instance_ = false;
+  _cached_size_ = 0;
+  seconds_ = GOOGLE_LONGLONG(0);
+  nanos_ = 0;
+}
+
+Duration::~Duration() {
+  // @@protoc_insertion_point(destructor:google.protobuf.Duration)
+  SharedDtor();
+}
+
+void Duration::SharedDtor() {
+  if (this != default_instance_) {
+  }
+}
+
+void Duration::SetCachedSize(int size) const {
+  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
+  _cached_size_ = size;
+  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+}
+const ::google::protobuf::Descriptor* Duration::descriptor() {
+  protobuf_AssignDescriptorsOnce();
+  return Duration_descriptor_;
+}
+
+const Duration& Duration::default_instance() {
+  if (default_instance_ == NULL) protobuf_AddDesc_google_2fprotobuf_2fduration_2eproto();
+  return *default_instance_;
+}
+
+Duration* Duration::default_instance_ = NULL;
+
+Duration* Duration::New(::google::protobuf::Arena* arena) const {
+  Duration* n = new Duration;
+  if (arena != NULL) {
+    arena->Own(n);
+  }
+  return n;
+}
+
+void Duration::Clear() {
+#define ZR_HELPER_(f) reinterpret_cast<char*>(\
+  &reinterpret_cast<Duration*>(16)->f)
+
+#define ZR_(first, last) do {\
+  ::memset(&first, 0,\
+           ZR_HELPER_(last) - ZR_HELPER_(first) + sizeof(last));\
+} while (0)
+
+  ZR_(seconds_, nanos_);
+
+#undef ZR_HELPER_
+#undef ZR_
+
+}
+
+bool Duration::MergePartialFromCodedStream(
+    ::google::protobuf::io::CodedInputStream* input) {
+#define DO_(EXPRESSION) if (!(EXPRESSION)) goto failure
+  ::google::protobuf::uint32 tag;
+  // @@protoc_insertion_point(parse_start:google.protobuf.Duration)
+  for (;;) {
+    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoff(127);
+    tag = p.first;
+    if (!p.second) goto handle_unusual;
+    switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
+      // optional int64 seconds = 1;
+      case 1: {
+        if (tag == 8) {
+          DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
+                   ::google::protobuf::int64, ::google::protobuf::internal::WireFormatLite::TYPE_INT64>(
+                 input, &seconds_)));
+
+        } else {
+          goto handle_unusual;
+        }
+        if (input->ExpectTag(16)) goto parse_nanos;
+        break;
+      }
+
+      // optional int32 nanos = 2;
+      case 2: {
+        if (tag == 16) {
+         parse_nanos:
+          DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
+                   ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
+                 input, &nanos_)));
+
+        } else {
+          goto handle_unusual;
+        }
+        if (input->ExpectAtEnd()) goto success;
+        break;
+      }
+
+      default: {
+      handle_unusual:
+        if (tag == 0 ||
+            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
+            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+          goto success;
+        }
+        DO_(::google::protobuf::internal::WireFormatLite::SkipField(input, tag));
+        break;
+      }
+    }
+  }
+success:
+  // @@protoc_insertion_point(parse_success:google.protobuf.Duration)
+  return true;
+failure:
+  // @@protoc_insertion_point(parse_failure:google.protobuf.Duration)
+  return false;
+#undef DO_
+}
+
+void Duration::SerializeWithCachedSizes(
+    ::google::protobuf::io::CodedOutputStream* output) const {
+  // @@protoc_insertion_point(serialize_start:google.protobuf.Duration)
+  // optional int64 seconds = 1;
+  if (this->seconds() != 0) {
+    ::google::protobuf::internal::WireFormatLite::WriteInt64(1, this->seconds(), output);
+  }
+
+  // optional int32 nanos = 2;
+  if (this->nanos() != 0) {
+    ::google::protobuf::internal::WireFormatLite::WriteInt32(2, this->nanos(), output);
+  }
+
+  // @@protoc_insertion_point(serialize_end:google.protobuf.Duration)
+}
+
+::google::protobuf::uint8* Duration::SerializeWithCachedSizesToArray(
+    ::google::protobuf::uint8* target) const {
+  // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.Duration)
+  // optional int64 seconds = 1;
+  if (this->seconds() != 0) {
+    target = ::google::protobuf::internal::WireFormatLite::WriteInt64ToArray(1, this->seconds(), target);
+  }
+
+  // optional int32 nanos = 2;
+  if (this->nanos() != 0) {
+    target = ::google::protobuf::internal::WireFormatLite::WriteInt32ToArray(2, this->nanos(), target);
+  }
+
+  // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.Duration)
+  return target;
+}
+
+int Duration::ByteSize() const {
+  int total_size = 0;
+
+  // optional int64 seconds = 1;
+  if (this->seconds() != 0) {
+    total_size += 1 +
+      ::google::protobuf::internal::WireFormatLite::Int64Size(
+        this->seconds());
+  }
+
+  // optional int32 nanos = 2;
+  if (this->nanos() != 0) {
+    total_size += 1 +
+      ::google::protobuf::internal::WireFormatLite::Int32Size(
+        this->nanos());
+  }
+
+  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
+  _cached_size_ = total_size;
+  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  return total_size;
+}
+
+void Duration::MergeFrom(const ::google::protobuf::Message& from) {
+  if (GOOGLE_PREDICT_FALSE(&from == this)) MergeFromFail(__LINE__);
+  const Duration* source = 
+      ::google::protobuf::internal::DynamicCastToGenerated<const Duration>(
+          &from);
+  if (source == NULL) {
+    ::google::protobuf::internal::ReflectionOps::Merge(from, this);
+  } else {
+    MergeFrom(*source);
+  }
+}
+
+void Duration::MergeFrom(const Duration& from) {
+  if (GOOGLE_PREDICT_FALSE(&from == this)) MergeFromFail(__LINE__);
+  if (from.seconds() != 0) {
+    set_seconds(from.seconds());
+  }
+  if (from.nanos() != 0) {
+    set_nanos(from.nanos());
+  }
+}
+
+void Duration::CopyFrom(const ::google::protobuf::Message& from) {
+  if (&from == this) return;
+  Clear();
+  MergeFrom(from);
+}
+
+void Duration::CopyFrom(const Duration& from) {
+  if (&from == this) return;
+  Clear();
+  MergeFrom(from);
+}
+
+bool Duration::IsInitialized() const {
+
+  return true;
+}
+
+void Duration::Swap(Duration* other) {
+  if (other == this) return;
+  InternalSwap(other);
+}
+void Duration::InternalSwap(Duration* other) {
+  std::swap(seconds_, other->seconds_);
+  std::swap(nanos_, other->nanos_);
+  _internal_metadata_.Swap(&other->_internal_metadata_);
+  std::swap(_cached_size_, other->_cached_size_);
+}
+
+::google::protobuf::Metadata Duration::GetMetadata() const {
+  protobuf_AssignDescriptorsOnce();
+  ::google::protobuf::Metadata metadata;
+  metadata.descriptor = Duration_descriptor_;
+  metadata.reflection = Duration_reflection_;
+  return metadata;
+}
+
+#if PROTOBUF_INLINE_NOT_IN_HEADERS
+// Duration
+
+// optional int64 seconds = 1;
+void Duration::clear_seconds() {
+  seconds_ = GOOGLE_LONGLONG(0);
+}
+ ::google::protobuf::int64 Duration::seconds() const {
+  // @@protoc_insertion_point(field_get:google.protobuf.Duration.seconds)
+  return seconds_;
+}
+ void Duration::set_seconds(::google::protobuf::int64 value) {
+  
+  seconds_ = value;
+  // @@protoc_insertion_point(field_set:google.protobuf.Duration.seconds)
+}
+
+// optional int32 nanos = 2;
+void Duration::clear_nanos() {
+  nanos_ = 0;
+}
+ ::google::protobuf::int32 Duration::nanos() const {
+  // @@protoc_insertion_point(field_get:google.protobuf.Duration.nanos)
+  return nanos_;
+}
+ void Duration::set_nanos(::google::protobuf::int32 value) {
+  
+  nanos_ = value;
+  // @@protoc_insertion_point(field_set:google.protobuf.Duration.nanos)
+}
+
+#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
+
+// @@protoc_insertion_point(namespace_scope)
+
+}  // namespace protobuf
+}  // namespace google
+
+// @@protoc_insertion_point(global_scope)