Added the crop_only mode, with new parameters to use it : crop_only, crop_x crop_y crop_width and crop_height. Some code cleaning to
typos
updates
Merge pull request #13 from extralagence/master

Added the crop mode
Lowercase the output urls

Closes #10 #15
WordPress standards
Added `quality` parameter

Thanks @dominicwhittle, from https://github.com/dominicwhittle/bfi_thumb
Fixed typo in the readme
Fixed missing parenthesis
Merged from bfintal/master, fixed  warning and added params in comment