Working on Controller

Added Controller class, anonymous action listeners for buttons, JTree with FileTreeModel for SelectScreen and app main class - FileSieve.java (still need to add it to build.xml though).
Also included Mockito in lib as I'm using it in tests.
It took me much longer than it should have to decide on the structure of the whole thing. And it probably is still not the best one. But at least now I got moving on GUI. If you have any advise on how to improve it I would greatly appreciate it. 
Thanks!