Update onebox gem to for recent goodness
Removes unnecessary instance vars.
PostsController tests clean up.
Merge pull request #2003 from velesin/posts_controller_instance_vars_fix

Removes unnecessary instance vars.
Merge pull request #2004 from velesin/posts_controller_tests_refactoring

PostsController tests clean up.
REFACTOR: We don't cache the json for the Site model anymore, so let's
rename and remove the methods leftover from that.
FIX: welcome topic should be uncategorized
BUGFIX: Don't return child categories if you can't see the parent
category.
FIX: n+1 queries in CategoryList
clean up plugin store when removing data instead of setting the value to nil.
FEATURE: single sign on support

Added support for outsourcing auth to a different website, documentation on meta
adding word-wrap: break-word back to usernames, fixing onebog bg in quotes
Merge pull request #2006 from awesomerobot/master

adding word-wrap: break-word back to usernames, fixing onebox bg in quotes
shorten to "Invite Friends"
deprecate this guide in favor of Docker
link to master install guide
deprecate this guide in favor of Docker
Update INSTALL-email.md
Rename HEROKU.md to install-HEROKU.md
normalize on Docker installs