First prototype
VKMessageCell renamed to VKBubbleCell
VKBaseBubbleCell
Size calculations refactored
Separated cell styling code
VKBubbleView - removed headers

Message details moved to bubble cell
VKMessagesViewController - removed cell factory methods
VKImageBubbleView - created
VKImageBubbleView - fixed content size
VKImageBubbleViewProperties
VKImageBubbleView - max size added
Image cell style
Podspec updated
Fixed bubble view layout changes
VKImageBubbleView - placeholder size added
VKMessagesViewController - removed scroll to bottom on input button press
VKTextBubbleView - size calculations based on NSAttributedLabel
VKTextBubbleView - added ability to use attributed strings
VKBubbleCell - layout behaviour updated