SECURITY: reduce moderator rights

You can now hide particular categories from certain moderators
SECURITY: dissalow mods from seeing PMs
another try fixing this test
fixing watermark/gutter link interference, and also adding a transition to the topic-progress bar, so smooth!
Merge pull request #1917 from awesomerobot/master

fixing watermark/gutter link interference
Merge pull request #1916 from vikhyat/pm-dominating

Don't notify about dominating private messages
Be slightly less aggressive at clearing assets
BUGFIX: make sure moderators can't view topics they aren't allowed to
Client and Server side routes for a Group
More templates for the group page
Move `Discourse.Group` into public models
Return a promise from `Discourse.Group.findAll()`
Rename `load` to `loadUsers` which is what the method was actually
doing.
Work in progress: Groups Page
Can list group members
Link to groups from user profile
FEATURE: First stab at groups page with member list
Added some specs for the group controller methods
Merge pull request #1913 from davidcelis/default-category-fields

Default values for posts/topics fields on Category
FIX: more protection from nil in count_with_subcategories