Create tracking branches to compare upstream changes:

GIT:
cd PROJECT
git remote update
git diff aosp/kitkat-release...caf/kitkat

GITHUB:
- Click "Compare & Review" near branch names
- Select left/right branches to be compared
- To download full patch add ".patch" to end off addressbar

Change-Id: I1ca145e635e4956b5aa8a09e7d93f7c210a1270d