Include binstubs generated by Rails 4

Commit b516ecc added `bin/` to the .gitignore file. Now that Discourse
runs using Rails 4 by default, however, we should include the binstubs
generated by `rake rails:update:bin` in version control as this is the
recommendation of the Rails core team. Additionally, for those wishing
to deploy Discourse to Heroku, these binstubs are actually mandatory
according to [this article](https://devcenter.heroku.com/articles/rails4).

Other binstubs can continue to be ignored.

Signed-off-by: David Celis <me@davidcel.is>
BUGFIX: Use email sender
Try to fix random failing spec
Locales/fr: Add filter strings and change :read_more_MF
Merge pull request #1921 from joallard/locale-fr

Locales/fr: Add filter strings and change :read_more_MF
Update Ember for CVE-2014-0046.
Merge pull request #1923 from rjackson/security-update-for-ember

Update Ember for CVE-2014-0046.
BUGFIX: allow sorting prior to sidekiq starting
Merge pull request #1912 from davidcelis/include-rails-binstubs

Include binstubs generated by Rails 4
Add memory profiler gem for ruby 2.1
BUGFIX: seen logic was incomplete, you can have user_data and still unseen topic
warning if running an old version of bundler
Remove memory profiler at least until I push a new docker image
oops clean gemfile lock
fix build
Merge pull request #1924 from awesomerobot/master

simplfying color palette, collecting colors into unified variables
FIX: Show the renamed uncategorized name instead of "(no category)"
Add groups list to the poster expansion when you click an avatar while
in a topic.
FIX: Chrome has a bug where if you request the same URL with a different
MIME type, then leave and hit the back button, you'll get the last MIME
type requested instead of HTML. This fixes it.
When creating/editing a category the parent shoudl be none.