Disabled responsive images in the backend for the time being.

Explanation: there's a CSS technique for making images responsive by applying
max-width: 100%; and height: auto; to them. This messes with the bundled Xinha
WYSIWYG editor. The buttons in Xinha's toobars can't have max-width: auto;, it
makes them disappear.

So far, I haven't found a way to overwrite this for the toolbar images only due
to selector specifity. Either need to find a way or find a way to make other
images (media, actually) in the backend have a class which assigns the responsive
media CSS to them.

(Or drop Xinha for good, but that doesn't seem to be an option.)

templates/2k11/admin/style.css

@@ -214,14 +214,14 @@ img { vertical-align: middle; }
 
 /* Responsive media objects
    http://unstoppablerobotninja.com/entry/fluid-images */
-embed,
+/*embed,
 object,
 audio,
 video,
 img { max-width: 100%; }
 
 video,
-img { height: auto; }
+img { height: auto; }*/
 
 fieldset {
     border: 0;