[BUGFIX beta] Do not compare meta in deepEqual.

In non-ES5 browsers the `QUnit.deepEqual` will also compare `__ember_meta__` property (which is highly unlikely to match).

This adds a helper method named `withoutMeta` for these tests specifically.

Before:

![screenshot](http://monosnap.com/image/8jH6q8qh5jSblPZCanQf1OP5fv0L6c.png)

After:

![screenshot](http://monosnap.com/image/5rLl6zgw5T58Z2RVWCA40j27JCGtzL.png)

(note: still working on the `computed.intersect` error)

Closes #5158.