MMLoadingButton
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Custom Loading Button With Animation
If you call stopLoading on the button before the animation for startLoading is finished, the CAAnimationDelegate's animationDidStop for "ShrinkStart" sets the stateLayer's currentState to ".loading" even though stopLoading set the...
Before start loading.  After stop loading. 
- Replace `M_PI_2` with `Double.pi / 2` - Replace `M_PI` with `Double.pi`
Hey! first of all, nice library. One thing I notice is that you wrote **Scuess** plenty of times when it should be **Success**.