Fix issues raised through TestSwarm

Fix issues raised through TestSwarm
* Instead of delete window.foobar whitelist the global in QUnit.config.pollution
** the reason either is needed is to make QUnit's "noglobal" option useful)
** delete window.foo throws an "TypeError: Object doesn't support this action" in Internet Explorer.
-> http://perfectionkills.com/understanding-delete/
* Remove other globals introduced