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
[ADD] add new function `get_data_icon` and update freeroi
Merge pull request #38 from sealhuang/master

[ADD] add new function `get_data_icon` and update freeroi
PEP8
Merge pull request #39 from xtao/pep8

PEP8 corrected.
Merge branch 'master' of github.com:BNUCNL/FreeROI