ENH: github markdown style.
ENH: github markdown style.

Change-Id: I4cf2ff8ba33af5fbdc7c79f02ebb4c7d12bd419b

KitwareMedical/TubeTK,matthieuheitz/TubeTK,thewtex/TubeTK,sumedhasingla/TubeTK,thewtex/TubeTK,cdeepakroy/TubeTK,KitwareMedical/ITKTubeTK,matthieuheitz/TubeTK,LucasGandel/TubeTK,sumedhasingla/TubeTK,LucasGandel/TubeTK,cdeepakroy/TubeTK,aylward/ITKTubeTK,cdeepakroy/TubeTK,KitwareMedical/TubeTK,matthieuheitz/TubeTK,KitwareMedical/ITKTubeTK,thewtex/TubeTK,LucasGandel/TubeTK,aylward/ITKTubeTK,sumedhasingla/TubeTK,KitwareMedical/ITKTubeTK,KitwareMedical/ITKTubeTK,aylward/ITKTubeTK,KitwareMedical/TubeTK,aylward/ITKTubeTK,sumedhasingla/TubeTK,matthieuheitz/TubeTK,thewtex/TubeTK,KitwareMedical/TubeTK,LucasGandel/TubeTK,cdeepakroy/TubeTK