WIP: add demo script to extract a connected functional label
ENH : add connected param in stc_to_label + simplify functional label extraction (still WIP)
ENH : order labels based on max + better example
TST : add test for stc.mean
TST : add test for stc_to_label with connected==True
ENH : simplify and better document example
pep8
Merge pull request #730 from agramfort/add_example_functional_label

WIP: add demo script to extract a connected functional label