Merge pull request #1 from liuzhaoguo/master

add 2d and 3d region grow
Merge pull request #2 from liuzhaoguo/master

another version of region_t region grow
Create README.md
add some files..
Merge branch 'master' of github.com:BNUCNL/region-growing-froi

add new files.
Create the RegionGrowing class.
add SimilarityCriteria class.
add StopCriteria class.
remove ClassTest.py
Merge pull request #3 from zhouguangfu/master

remove ClassTest.py
prilimilary try to add average contrast