Added support for WOFF2 file types in the font-files helper function.

Change-Id: I76d2004eeace97b96826ab6d9d6df9242ba78d7e
Merge pull request #1742 from williamboman/master

WOFF2 support for font-files
Merge remote-tracking branch 'origin/master' into stable
Add missing image.
Update CHANGELOG
Grammar update.