Stefans growcut code
Branch for GPU code:
- CLGL Viewer
- shared data types (Image, Buffer)
undoing incorrect commit of growcut code
Tile based computation
Merge branch 'master' of https://github.com/mdeklerk/scikit-image into gpu
change dependency from PyQt5 to PyQt4
GPU growcut
change dependency from PyQt5 to PyQt4
Merge remote-tracking branch 'origin/gpu_growcut' into gpu_growcut

Conflicts:
	doc/examples/view_growcut_gpu.py