Added separate iPad storyboard.
Early implementation of iPad UI.
Tweaked visible widths.
Fixed menu button on iPhone.
Many layout fixes on iPad.
Added settings support on iPad.
Also fixed issue with broken nav bar text colour after changing theme.
Open link as a new panel by tapping the title.
Increment version to 2.0 beta 1, build 15.
Merge pull request #3 from weiran/Universal

Pull in iPad UI beta 1.