Build: ant size will now give you a report detailing differences in size since the last time you ran the report

(cherry picked from commit 264139b)

Conflicts:

	build/build.xml

Author: gnarf

.gitignore

@@ -1,4 +1,6 @@
 build/dist
+build/size
+build/build/.sizecache.json
 docs
 .project
 *~