Remove ‘ob_clean’ function from renderOutputHeaders method

It was unnecessary and was causing errors in images in some environments. Sorts symphonycms/jit_image_manipulation#67
Merge pull request #81 from DavidOliver/integration

Remove ‘ob_clean’ function from renderOutputHeaders method. Fixes #67
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.
Simplify TMP directory logic now that we can rely on Symphony's
Fix whitespace

Related to symphonycms/symphony-2#1621
Merge pull request #83 from nilshoerrmann/integration

Fix excess whitespace in .htaccess
Release 1.3