Remove unused library
Add Firefox extension mimetypes. Fixes updating of Firefox extensions hosted by Play
Fix xml document missing some code .Fixes #919
Merge pull request #643 from benmccann/deps

Remove unused library
Merge pull request #650 from sjbwylbs/master

Fix xml document missing some code .Fixes #919 Resubmit.
Merge pull request #644 from benmccann/firefox

Fix updating of Firefox extensions hosted by Play
Corrected play building steps documentation. 
Merge pull request #656 from xaoc3dgraph/master

 Corrected play building from source steps documentation