some fixes + slidingMenu

there is a sliding Menu in the SceneView. you can slide out, but the
menu itself (for exsample: button actions) is not working right now.
merge conflicts
fixes #87 and slidingView Problem solved

Testes the fix for issue #87 with "Drum Kit" and it worked as expected.

Furthermore the slideView is now available and visible!
fixed issue #89 and other bugs

Fixed issue concerning IDE Toolbar visible at other Views. Some changes
to the issue concerning "images are not centered in the table views"
and added code for providing a screenshot of the level.