More autolayout fixes for both iOS 6 and 7.

Improved full screen layout - both iOS 6 and 7.

Removed unused image index label.

Improved image title constraints on iOS 7.

Better refresh control mechanics with auto layout.

My Uploads collection view top now rest below nav bar so pull to refresh begins from there rather than top of screen behind title bar.

Removed refresh control text.

Fixed freeze on iOS 7 when transitioning from login page when previous credentials found.