add description for X-Storage-Type, remove debug log

lib/response.js

@@ -52,7 +52,6 @@ module.exports = function(request, response, result) {
   }
 
   if (result.status !== undefined && result.status !== null) {
-    logging.debug("status: " + result.status);
     headers["X-Storage-Type"] = human_status[result.status];
   }
 

lib/views/index.jade

@@ -279,6 +279,7 @@ block content
               a(id="meta-x-storage-type" class="anchor")
               a(href="#meta-x-storage-type")
                 h4 X-Storage-Type
+              p Details about how the requested image was stored on the server
               ul
                 li <b>none</b>: No external requests. Cached: User has no skin.
                 li <b>cached</b>: No external requests. Skin cached and stored locally.