Propagating changes from code.google.com(https://codereview.appspot.com/13536043/).
This is a refactoring to support the addition of another script
needed in the code.google.com repository but not needed in i18n.
Merge remote-tracking branch 'codedotorg/mooc' into i18n
Removed out-of-date translation files.
Merge pull request #20 from espertus/i18n

I18n changes
Fixed poor merge.
Merge remote-tracking branch 'codedotorg/mooc' into mooc

Conflicts:
	i18n/xliff_to_json.py