Remove empty drawRect.
Update README

Add special notes to try and help with problems noted in issues #52, #55
Fix double-drawing on IB-created instances.
Added pre- and post-animation hooks for subclass usage.
Update Cocoadocs README links
Remove version-specific Cocoapods instruction
Slight tweaks to MarqueeLabel.h documentation
Eliminate double check for labelization.
Base implementation of CAKeyframeAnimation-based marquee.
Add CAMediaTimingFunction category to solve timing function input-output points.
Re-implemented MarqueeLabel using CoreAnimation.
Rename lengthOfScroll property to scrollDuration.
Fix label pausing/unpausing.
Revise “default” case for MarqueeType.
Fix completion block handling of gradient fade animation.
Revise demo project, plus conversion to Storyboard-based.
Improve some parts of the demo.
Tweak tapToScroll documentation.
Fix gradient “sticking” when label size changes.
Update podspec.