Move 2015-specific code to its own folder.

Known issues:
  -I didn't change the namespace for it, but I am open to discussion
   on doing that in a separate change.
  -There are a couple of files which should get split out into
   year-specific and not-year-specific files to reduce how much needs
   to get copied around each year still.
  -The control loop python code doesn't yet generate code with the
   right #include etc paths.

Change-Id: Iabf078e75107c283247f58a5ffceb4dbd6a0815f
diff --git a/aos/common/byteorder.h b/aos/common/byteorder.h
index c616d68..ae6ecf4 100644
--- a/aos/common/byteorder.h
+++ b/aos/common/byteorder.h
@@ -5,6 +5,7 @@
 #include <endian.h> // endian(3)
 #endif
 #include <string.h>
+#include <stdint.h>
 
 // Contains functions for converting between host and network byte order for
 // things other than 16/32 bit integers (those are provided by byteorder(3)).