To make the UI more cleaner and convenient,we update the list_view .
Remove the 'main_win' parameter of the list_widget module.
Change the UI, add the tabwidget control to make the UI brief .
Merge pull request #33 from zhouguangfu/master

Change the UI, add the tabwidget control to make the UI brief .
extract icon_dir to be a separate file
separate icon_dir to a new file
add utils.py and make the code to be more clear
change a wrong else in utils.py
Merge pull request #34 from liuzhaoguo/extract_icon_dir_file

Extract icon_dir function to be  a separate file
move some algorithms(region_grow,watershed,localmax,edge_detection) from menu bar to bottom-left tools box
add segmentationwidget to toolbox
add statswidget to toolbox
move roifilter and roimerge to ROItools of tools box
Merge pull request #36 from liuzhaoguo/move_algorithms_to_tools_box

move algorithms to bottom-left tools box.
HLJ: Well done!
the y_coordinate of region growing match the display
Merge pull request #37 from liuzhaoguo/move_algorithms_to_tools_box

the y_coordinate of region growing match the display