Added sentStatus to JSQCollectionViewCell
Merge branch 'release-6.0' of https://github.com/okland/JSQMessagesViewController

Conflicts:
	JSQMessagesViewController/Views/JSQMessagesCollectionViewCellIncoming.xib
	JSQMessagesViewController/Views/JSQMessagesCollectionViewCellOutgoing.xib
Improvement of incoming view nib
Merge branch 'release-6.0' of https://github.com/okland/JSQMessagesViewController

Conflicts:
	JSQMessagesViewController/Views/JSQMessagesCollectionViewCell.h
	JSQMessagesViewController/Views/JSQMessagesCollectionViewCellIncoming.xib
	JSQMessagesViewController/Views/JSQMessagesCollectionViewCellOutgoing.xib
Update incoming cell + update demo to show message status
fix crash when user use Undo after sending text message
Merge pull request #511 from alr/develop

fix crash when user shakes-to-undo after sending text message. close #508
Added enums for message sent status
Merge branch 'develop' into release-6.0
fix #514
update cocoapods
rebuild xcode project - fuck you xcode. update assets (#). clean up file imports. use modern objC. update podfile.
update assets #502. begin JSQMessagesMediaPlaceholderView. #504
turn off springiness in demo
implement basic placeholder media view. #504
adjust typing indicator view
fix JSQMessagesTypingIndicatorFooterView layout constraints
formatting. update comments
remove duplicate constraints in cell xibs.
resolve TODOs