Added new HMSegmentedControlSelectionStyle of Arrow

Also fixed some title positioning math:
-the title label position is now vertically adjusted for when the
HMSegmentedControlSelectionIndicatorLocation is Up or Down
-Title is now properly centered within it’s segment.
Fixes selection indicator when using HMSegmentedControlSegmentWidthStyleDynamic with HMSegmentedControlSelectionStyleBox
Refactoring
Fixes control preventing other scroll views from scrolling to top.
Merge branch 'master' of https://github.com/mrtristan/HMSegmentedControl into mrtristan-master

Adds HMSegmentedControlSelectionStyleArrow and fixes some title positioning math.
Minor code style refactoring
Updates header file documentation
Refactoring to have a more consistent coding style
Fixes a crash when using Storyboards
Silences warnings when building on Xcode 5.1
Merge remote-tracking branch 'HeshamMegid/master'