Remove unneeded folders.
Merge branch 'dev' into stable
Only remove one "../" from a CSS images URL, otherwise it will break references in Edit+ to standard EES images (with two ../'s) which needs to keep one of them post-minify.
Whoops, put it back to using str_replace, not preg_replace, as didn't need the latter.
Handle all variations of quote marks of url(../ so all images point to the correct location.
Not meant to commit the minified files
Merge changes from stable branch (which was only minify script changes) in for new dev.