add cas support with a few tests
allow disabling of local logins.  In the instance where an .edu is using cas they may not want a user to be able to log in once the users credentials have been revoked in the system that feeds the CAS authentication server.  This is very optional
simplify, clarify TextSentinel

codeclimate pointed this out. I agree it is better
to simplify and reveal intentions.
small refactor of RateLimiter for clarity
extract TopicNotifier class from topic
minor refactorings
Make pry a bit more useful
Extract Topic#posters_summary
Remove unused parameters from posters_summary
Sliding window rate limiting

Switched the algorithm to use a circular buffer
based on a redis list
Add Post#is_first_post?

We should be able to ask a post if it's the first in a topic
Add Topic#max_post_number to find max post number
Add Topic#url for determining url for a Topic
Add test to verify posts are moved in transaction
introduce strong_parameters
Extract PostMover from Topic into its own class
Merge pull request #903 from chrishunt/chrishunt/extract-post-move

Extract post move
Merge pull request #899 from chrishunt/chrishunt/extract-topic-posters-summary

Extract topic posters summary
Merge branch 'refactoring' of git://github.com/mattvanhorn/discourse

Conflicts:
	lib/text_sentinel.rb
Bad merge. Oddly not caught by autospec.