Added iOS 7 style arrow icons.
Tidy up
Caption view now updated for iOS 7 (using blurry goodness).
Added UIActivityViewController on iOS >= 6 to handle actions. Actions are now customisable by implementing a delegate method.

Closes #75
Status bar now hides in iOS 7.

It's glitchy but best that can be done with this issue outstanding: https://devforums.apple.com/message/899765
Fixed issue with zoom being changed when it doesn't need to be.
Disabled interaction on caption so zoom touches work better.
Updated control animations and fixed issue with nav bar appearing after rotation on iOS 7.
Action button is now shown on the right of the nav bar when possible.