Fxied some bugs. Made the delete volume function  work properly and combined the voxel, ROI and ROI bacth function. Fixed the bug of binarization function, too.
Merge pull request #54 from zhouguangfu/master

Fxied some bugs. Made the delete volume function work properly and combined the voxel, ROI and ROI bacth function. Fixed the bug of binarization function, too.