Finish auto-converting most of the gyp files.

I've also started writing down which ones need manual work.

Change-Id: I442782e1e3352e0de32b612f1bd2c167f231495a
diff --git a/y2014/BUILD b/y2014/BUILD
index 9c65f34..e6c9019 100644
--- a/y2014/BUILD
+++ b/y2014/BUILD
@@ -5,6 +5,9 @@
   srcs = [
     'constants.cc',
   ],
+  hdrs = [
+    'constants.h',
+  ],
   deps = [
     '//aos/common/logging',
     '//aos/common:once',