Added basic functionality to main admin panel view
Added UserOverview controller and view
Changed AdminController to singleton
Implemented user overview
Added tweet count and positive tweet count visitors
Renamed AddTweet to AddTextTweet
Added UserTreeModel and GroupChangeListener to automatically update the tree
Added helper methods on view to access data
Fixed display of positive message as percentage
Removed debug statements
Moved vistor package under model
Fixed off by one error in UserTreeModel::getChild
Added IndexedHashMap to get LinkedHashMap items by their position
Changed some ids
Added support for default id based on field name
Moved show positive message percentage dialog location
Restructed app
Added Entity composite class
Added Repositories and StorageEngines
Removed DataSource singleton