fix firefox CDN issue and ensure twitter handle, email and username are lowercase

controllers/user.js

@@ -173,7 +173,7 @@ exports.getAccount = function(req, res) {
  */
 
 exports.returnUser = function(req, res, next) {
-  User.find({'profile.username': req.params.username}, function(err, user) {
+  User.find({'profile.username': req.params.username.toLowerCase()}, function(err, user) {
     if (err) { debug('Username err: ', err); next(err); }
     if (user[0]) {
       var user = user[0];