Fixed SelectBox::hideList()

stageListener of SelectList should be removed in hideList()
(not only in touchUp method, where it was removed previously),
because hideList() call be called without any touch input.
No more AWT toolkit for PPI.
Eh, guess we'll roll with the Toolkit PPI. :/
Javadocs.
Add exception() for uncaught.
Sync GWT backend with changes to core.
Prevent duplicate mouse up events from ruining mouse input.

This was reproduced by double clicking a xfiledialog. The second click causes it to disappear and GLFW gives us a mouse up with no corresponding mouse down. Maybe because it is a modal child of the GLFW window? Hope there is no way to get incorrect mouse downs, or we'll be screwed.
Merge remote-tracking branch 'origin/master'
[fixed] NativeCodeGenerator, does null checks on direct buffers now.
Better x,y,width,height.
Merge remote-tracking branch 'origin/master'
Missed a change.
Prevent graphics size going to zero (happens on minimize).
Merge pull request #289 from kreymerman/patch-1

Fixed SelectBox::hideList()
Missing semicolon... bad PR!
Tileset loads more useful properties
Improve docs
Fixed windows key.
Merge remote-tracking branch 'refs/remotes/origin/master'
Null check list before hiding.