Improved SWDF_get_img_path_info() and added phpDoc
Improved SWDF_get_allowed_sizes() and added phpDoc
Improved SWDF_validate_resize_request() and added phpDoc
Rearanged order of functions in file.
!!!Altered order of arguments in SWDF_image_resizer_request()!!!

The order is now: $img, $size, $authorized

This is to bring it in line with SWDF_validate_resize_request() and
to keep to the standard of placing optional arguments to the right
side of the list.
Bumped to version v0.2.0
Placed warning at top of the README
Merge branch 'develop'