Handling push notifications from Mixpanel.

Right now we can open up the reader and the notifications.
Added in way to open stats from Mixpanel push not
Fixed synchronization of app group shared defaults to show today widget
Notifications.Storyboard: Updates GestureRecognizer Settings
NotificationDetailsViewController: Adds GestureRecognizer delegate
Moves reader comments into its own view controller.

Tapping on the comment icon on the post list or detail take you to the comment list.
Replace html smileys with emoji in reader posts and comments.
NotificationDetailsViewController: Updates bool
NotificationSettings: Nukes dead code
NotificationSettings: Nukes public properties
NotificationSettings: Nukes EGORefresh
NotificationSettings: Nukes EGORefresh. Part II
NotificationSettings: Nukes inline strings
NotificationSettings: Nukes duplicated save code
NotificationSettings: Code cleanup
NotificationSettings: Nukes old mute settings
NotificationSettings: Replaces inline string
NotificationSettings: Bypassing foreverKey from reset helper
NotificationSettings: Fixes pull to refresh flicker
Merge branch 'develop' of github.com:wordpress-mobile/WordPress-iOS into issues/2395-separate-comments

Conflicts:
	WordPress/Classes/ViewRelated/Reader/ReaderPostDetailViewController.m
	WordPress/WordPress.xcodeproj/project.pbxproj