Fix for Scroll Animation
Added two public methods to control collectionview scroll animation
More refactoring to the newly added methods
Updated link in README for updated iOS 6 adoption stats
Merge pull request #673 from ranunez/develop

Updated link in README for updated iOS 6 adoption stats
add button customization comments to demo. #669
Merge branch 'develop' of https://github.com/jessesquires/JSQMessagesViewController into develop
update README for customizing toolbar buttons. close #669
Merge pull request #651 from deepakraj89/Fix_ScrollAnimation

Fix for Scroll Animation (close #515)
clean up from PR #651. update docs.
add assert to didPressAccessoryButton:
Merge branch 'develop' of https://github.com/jessesquires/JSQMessagesViewController

Conflicts:
	JSQMessagesDemo/DemoMessagesViewController.m
	JSQMessagesViewController/Controllers/JSQMessagesViewController.m