Reenable asynchronous saved items loading

Reenable loading history, bookmarks, and saved pages async,
but load all three at once on viewDidLoad; no longer need to drop
cache when switching tabs since HTML data now lives on filesystem
rather than CoreData.
AutoLayout for iOS7
Fix SavedPages navbar for iOS6/7 consistency
Fix search layout for iOS7
Show keyboard when search is launched

Make searchbar the first responder when search button is clicked
so that keyboard shows and caret is placed in search field.
Remove old code

Remove files and references for SearchViewController and
TTTAttributedLabel.
Persist fullscreen status in User Defaults

Save whether the app is in fullscreen mode in User Defaults,
fixing the issue where transitioning from fullscreen page view to
external web view didn't show fullscreen toggle, making it
impossible to toggle fullscreen mode or go back to the page view,
and allowing the mode setting to persist between app launches.
Initial commmit for CocoaPods and MMDrawerController