Fix typo README.md
HistoryController.handleSearchByKey uses ContactProvider for data
Split ChatUtils in to Palaver- & ConnectionManager

- Do not use smack Chat or Chatmanager anymore
- ChatListener is obsolete and removed
- MessageListener extends only a PacketListener
Code cleanup AccountProvider
Formt code
Add Notifications via controlsfx
Remove debug
Remove unneeded logging
Use datafx withAction for Button Actions
Add Feature part to README.md
Add carbon support to MsgListener
Fix ContactConroller icon size
Extend Readme
Merge branch 'development' for 0.1.1-SNAPSHOT