Remove left-over toLowerCase()s.

This was sort-of resolved by #216, but the query
was still being lowercased in one place, meaning that the results were
not being rendered (!!) when the query contained uppercase chars.

Author: adammck

src/jquery.tokeninput.js

@@ -795,7 +795,7 @@ $.TokenList = function (input, url_or_data, settings) {
                   cache.add(cache_key, settings.jsonContainer ? results[settings.jsonContainer] : results);
 
                   // only populate the dropdown if the results are associated with the active search query
-                  if(input_box.val().toLowerCase() === query) {
+                  if(input_box.val() === query) {
                       populate_dropdown(query, settings.jsonContainer ? results[settings.jsonContainer] : results);
                   }
                 };