Move thread cell to a nib and always show full thread title.
Change thread list cell separator insets when appearing.

What I assume is a bug in iOS 8 seemingly prevents any value less than 16 from taking effect for the separatorInset.left. Oh well.
Fix disappearing Messages tab after restoring state.
Switch PM list to auto layout.
Use auto layout thread cell in thread preview, excising AwfulThreadCell for good.
Update Dependencies: AFNetworking, GRMustache, HTMLReader
Update Swift sources for Beta 7
Switch image preview to UIActivityController