Src: Export Assert methods for backwards compatibility

Ref: https://github.com/jquery/qunit/pull/577#issuecomment-47281591

The tests are rude, but I couldn't think on anything better yet.
I'm doing this, but there's no undo from declaring jshint globals in the after `/* global ... */`.

I tried things like this: 

```js
	/* global ok: false, equal: false */

	ok( true );
	equal( 2, 2);

	/* global -ok, -equal */

	ok( true );
	equal( 2, 2);
```

JSHint didn't warn after the `-`. Tried after their [docs](http://www.jshint.com/docs/)