Resolve "Resize : crop or pad"
Resize images to get a square shape with the following methods:
- crop
- "resize" : upscale, downscale
- pad
- BORDER_CONSTANT seems to be the most realistic, do we need more ?
Square shape may be the more suitable shape to different apps' formats, and customizing format may not be usable nor useful for analysis purposes
Closes #21 (closed)