Move stupidtable.js into application.js.

Fixes this javascript error:

    Uncaught TypeError: $(...).stupidtable is not a function

on these pages:

* http://safebooru.donmai.us/reports/user_promotions
* http://safebooru.donmai.us/reports/contributors
* http://safebooru.donmai.us/reports/janitor_trials

...due to stupidtable.js not loading.

app/assets/javascripts/application.js

@@ -5,6 +5,7 @@
 //= require jquery-ui-autocomplete-custom.js
 //= require jquery.storageapi.js
 //= require ugoira_player.js
+//= require stupidtable.js
 //= require rails.js
 //= require common.js
 //= require_tree .