Fix FixedThresholdSRG function bugs when stop criteria is 'size'.
Remove RegionGrowing class and rename the FixedThresholdSRG class to SeededRegionGrowing.
Merge branch 'master' of github.com:BNUCNL/region-growing-froi

Conflicts:
	algorithm/region_growing.py
Remove RegionGrowing class and rename the FixedThresholdSRG class to SeededRegionGrowing.
Merge pull request #12 from zhouguangfu/master

Remove RegionGrowing class and rename the FixedThresholdSRG class to SeededRegionGrowing.