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.
Prevents hitting callback when the instance was released
Moved method opening brace to its own line, per the style guide.
Shortened line length of long method.
Don't replace wp.com account on Jetpack login

If there's already a wp.com account set up in the app, let's respect
that instead of replacing it.

Fixes #2259
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
Temporarily disable REST for Jetpack sites

It just doesn't work when the JSON API module is disabled.
Also, there are some issues where failed uploads don't show any error.
Enable Jetpack REST for debug/internal builds

fixes #2258