Add regex validations for OAuth, UA, and S3 fields
Add a SiteSetting to control the pop3 polling period.

The default 5 minutes may add too much lag for some sites used to mailing list performance.

Unfortunately, this seems to require restarting the server for the change to be noticed - is there any way to avoid that, or otherwise should this be noted in the setting text?
Make bookmarks menu appear all the time
Merge pull request #2462 from techAPJ/bookmarks-menu-patch

Make bookmarks menu appear all the time
better copy for preformatted text
remove extra border on flags/flaggers td
minor copyedits on new account page
get rid of some needless (?) img styles on mobile
BUGFIX: properly enforce image dimensions on mobile
Merge pull request #2460 from riking/site-settings

Add regex validations for OAuth, UA, and S3 fields
Merge pull request #2461 from peternlewis/pop3s_polling_period_mins

Add a SiteSetting to control the pop3 polling period.
FIX: make pm notification badge green on mobile
Add a note to pop3s_polling_period_mins saying that it requires restart
FEATURE: rake task to clean up all the avatar thumbnails
TRIVIAL: remove commented file
changing the tracking dropdown highlight for consistency
BUGFIX: can't ctrl+click post datestamps
Merge pull request #2463 from awesomerobot/master

changing the tracking dropdown highlight for consistency
FIX: If there is no `last_posted_at` don't raise an exception
FIX: Don't raise an exception when `last_posted_at` is nil