Comment like POC.
Merge branch 'develop' into feature/2036-ios8-interactive-notifications

Conflicts:
	WordPress/Classes/Utility/NotificationsManager.m
Missed a merge conflict.
Added support for additional categories and actions.
Removed destructive moderation actions from enhanced notifications.
Merge branch 'develop' into feature/2036-ios8-interactive-notifications
Use the new CommentService APIs. Hat tip @lantean.
Use same category names as note actions. Hat tip @daniloercoli
Adds support for legacy notifications registration for iOS 7.
Uses updated category names.
Removed unused `likeComment` api method.

Set all actions to not require authentication as the Reply action will require unlock anyways.
Moved method opening brace to its own line, per the style guide.
Shortened line length of long method.
Updates Simperium to Mk 0.6.8
Merge pull request #2281 from wordpress-mobile/feature/2036-ios8-interactive-notifications

iOS 8 Interactive Notifications for Comments
Merge pull request #2293 from wordpress-mobile/issue/2292-updates-simperium-dependency

Updates Simperium to Mk 0.6.8
Merge branch 'develop' into issues/2208-add-mentions-to-commenting