Changed contacts data model.
Part of conversation data model is updated.
Updated SDK and client app to support latest data model changes
Finished conversation logic update.
Fixed some group chat bugs.
Updated copyright.
Implemented removing participants from the group chat.
Updated composing for group chats
Changed logic for showing messages. Fixed some issues in group chat. Handling open peer contact for which peer file is received after conversation thread is created.
Fixed duplicated cells in active chats view.
Merge branch 'feature-20140918-group-chat' into 20140401-dev-stable