Include binary data in diffs.
Update to use https for Rietveld.
Convince git-cl that images are binary.
Merge pull request #2 from jrioux/rietveld

Rietveld patches

Include binary data in the patch upload to Rietveld.

This works with both "git cl patch X" and "test-patches" aka Patchy.
Tested this myself with https://codereview.appspot.com/13054043/

Also update to use https.