Updated for iOS 7. Fixed alignment issue and bar tint colours.
Added `displayNavArrows` option (defaults to NO)
Updated for iOS 7 status bar handling, but animations aren't being respected so currently status bar does not get hidden.
Moved macros into preprocessor header.
Remove nav arrows from demo project.
Removed shadow from captions on iOS 7 and removed line limitation.
Fixed possible crash issue with scroll view delegate.

Fixes #121
Simplified loading image from file.

Closes #83
Added zoom to fill option so photos that almost fill the screen will be initially zoomed to fill.

Closes #116
Updated README