changed the region selection from top,bottom to min,max, releasing the constraints of reverse y direction
returned the ydir default to 'reverse', like in the OpenPIV and Insight - 0,0 will be top left corner
fixed the disturb.fig and disturb.m with the same notation of min,max instead of top,bottom
added a new checkbox for reversing the plot y-direction
Update README.rst
Merge remote-tracking branch 'origin/fix_column_profile'