Double Click , and mouse wheel support, bug fix drawing image with different color space then main window

[mwindowshz]

mouse wheel support was fixed to compile with opencv 2.4 only works with version 3 and above

double click support (in c++ not yet in python)

fixed bug render image with different color space from background image color space, we convert the image to background image.

[mwindowshz]

Hi I don't understand what is the problem with build fail, I updated code. how can I find out the problem? how can I take the automatically merged version, and test it? where is the version?