Update to support extensions & Xcode 7

Updated podspec for 0.3.1

Revving podspec to 0.3.0

Revving podspec to 0.2.3

Rev'ing podspec to 0.2.2 for release

Fixed deprecation warnings on iOS7+ only targets by moving to new APIs. 

Fixes #13.

Rev'ing podspec to 0.2.0

Implemented feedback from Ryan

Fixed bug on first show where HUD wouldn't display

Fixed bug on first show where HUD wouldn't display