Update Error Reporter to receive messages from RavenJS (bug 942912)

- Receive URL encoded JSON messages from RavenJS
- Pass out through Raven client
- Updated test
update docs from marketplace-docs repository
Merge pull request #1753 from clouserw/updatedocs

update docs from marketplace-docs repository
fix themes in promo
fix exclude unrated games + usk rating refused apps (bug 958319)
Merge pull request #1754 from ngokevin/master

fix themes in promo
Merge pull request #1747 from ngokevin/iarcusk3

fix exclude unrated games + usk rating refused apps (bug 958319)
fix theme promo on disco pane
Merge pull request #1713 from JaredKerim-Mozilla/942912

Update Error Reporter to receive messages from RavenJS (bug 942912)
Switch dev to Bango Test for Simone (bug 970310)
Fixed problem with weekly installs calculation (bug 962174)
Update ratings metric to record ratings per day (bug 858298)
Updated stats API for new stats
Merge pull request #1736 from diox/remove-update-version-magic

Remove magic that automatically updates *_version when accessed (bug 963662)
Show queue position for new versions of public apps (bug 931385)