After update specs fail when there is an unexpected ajax query, because
the response is not an ajax response.
A long term solution is to remove mockjax from specs, because it makes
them brittle and they usually fail after small changes. A better
approach would be to use fixtures, which are available for ember model
* if user is logged out, the default tab should be 'recent'
* when user logs in, the tab is switched to 'my repositories'
* when user logs out, my repositories is hidden again and tab is
switched to 'recent'
