upgraded nifty and nifty-default-controls to nightly build of 2011-03-24. Also fixed the AwtMouseInput and removed some ununsed imports. The com.jme3.niftygui.InputSystem has been changed as well to correspond with the new Nifty way of working with mouse events. It now uses the new MouseInputEventQueue and the new NiftyMouseInputEvent.
There is still an issue with the mouse buttons besides the first mouse button. These should be picked up by nifty, but for some reason are not triggering a MouseButtonEvent. This is something Kirril will need to take a look at.
git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@7114 75d07b2b-3a1a-0410-a2c5-0572b91ccdca