Merge pull request #12 from zhouguangfu/master

Remove RegionGrowing class and rename the FixedThresholdSRG class to SeededRegionGrowing.
Merge pull request #13 from zhouguangfu/master

Revise Seeds class and add RandomSeeds class.
add AdaptiveSRG
Merge pull request #14 from liuzhaoguo/master

add AdaptiveSRG
Merge branch 'master' of github.com:BNUCNL/region-growing-froi

Conflicts:
	algorithm/region_growing.py