allowed 3DRendering only for 4d-shapes, which are the ones the VolumeRendering can handle
Merge pull request #244 from buotex/6aa8c281e848b6929e0ee5f3471efccd14c63434

3DRendering Contextmenu
made lbp resp. skimage optional

Conflicts:
	ilastik/applets/objectExtraction/config.py
Merge pull request #247 from burgerdev/master

Quote escaping for Event Recorder
new design of startscreen and project menu
Merge pull request #249 from bheuer/master

finished work on startscreen
Merge pull request #1 from ilastik/master

Pull changes