Merge branch 'develop'

added following features
- tintColor support
- UIAppearance support (tintColor only)
version 1.1.1
- improved shrinking animtion.
- refactored managing indicatoView and gumView. #6
fix superScrollViewInset issue
hide when super scrollView tracking is NO
Merge branch 'feature/hideWhenTrackingIsNO' into feature/merge
fixed bug of hiding refresh control
Merge branch 'feature/merge' into develop
- consider contentInsets of super UIScrollView
- hide when inertial scrolling