Update project settings.
Utilize layoutSubviews to detect size changes.
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