Do SIFT and send out the results

Don't yet have the math for calculating poses based on these results.

Change-Id: I6494dbf1d3a7c13db902cf00b7c362a2a956691b
diff --git a/aos/time/time.h b/aos/time/time.h
index 27e4c70..e31de5c 100644
--- a/aos/time/time.h
+++ b/aos/time/time.h
@@ -99,6 +99,9 @@
 // epoch.
 struct timespec to_timespec(::aos::monotonic_clock::time_point time);
 
+// Converts a timeval object to a monotonic_clock::time_point.
+::aos::monotonic_clock::time_point from_timeval(struct timeval t);
+
 namespace time_internal {
 
 template <class T>