Added initial libusb driver.  This needs to be modified to build under GYP and with AOS.
diff --git a/gyro_board/src/libusb-driver/thread.cc b/gyro_board/src/libusb-driver/thread.cc
new file mode 100644
index 0000000..0121f35
--- /dev/null
+++ b/gyro_board/src/libusb-driver/thread.cc
@@ -0,0 +1,14 @@
+#include "thread.h"
+
+#include <boost/bind.hpp>
+
+
+void Thread::Terminate() {
+  boost::lock_guard<boost::mutex> lockguard(terminate_mutex_);
+  should_terminate_ = true;
+}
+
+bool Thread::should_run() {
+  boost::lock_guard<boost::mutex> lockguard(terminate_mutex_);
+  return !should_terminate_;
+}