Add no-transform in order to prevent ISPs to serve image over http through a compressing proxy.
Added the preference UI for disable_proxy_transform
Added the logic in the image handler for disable_proxy_transform
directly use the $settings array, since the Symphony class is not available
Merge pull request #79 from DeuxHuitHuit/not

Add no-transform in order to prevent ISPs to serve image over http through a compressing proxy.