Bug fix for Github issue #303 and cleaned up some formatting
Added unit test for centrality, formatted changes in setup.py and cleaned up network_centrality/utils.py
Merge branch 'master' into merge

Conflicts:
	CPAC/GUI/interface/windows/main_window.py
	CPAC/sca/utils.py
	CPAC/seg_preproc/__init__.py
	CPAC/seg_preproc/utils.py
Merge branch 'merge'