Switch to Boostrap Typeahead instead of JQuery-UI Autocomplete.

This reduces the number of CSS/JS files we need to load, which is awesome.

(imported from commit 3d34276a185e61f698163402cff2fd2c75ce0bd7)

zephyr/static/js/zephyr.js

@@ -608,13 +608,13 @@ function update_autocomplete() {
     instance_list.sort();
     people_list.sort();
 
-    $( "#class" ).autocomplete({
+    $( "#class" ).typeahead({
         source: class_list
     });
-    $( "#instance" ).autocomplete({
+    $( "#instance" ).typeahead({
         source: instance_list
     });
-    $( "#recipient" ).autocomplete({
+    $( "#recipient" ).typeahead({
         source: people_list
     });
 }