Correctly show anonymous authorized applications under Profile > Applications.

Fixes #1907.

Access tokens that were created using the ["Resource Owner Password Credentials" flow](http://doc.gitlab.com/ce/api/oauth2.html#resource-owner-password-credentials) by the user entering their username and password don't have a connected application, so the Profile > Applications page used to crash. These tokens are now rendered as "Anonymous" and can be revoked.

![Screen_Shot_2015-07-02_at_11.53.55](https://gitlab.com/gitlab-org/gitlab-ce/uploads/0fb044ce1fbf5d5e2825c3abee7763ee/Screen_Shot_2015-07-02_at_11.53.55.png)

See merge request !924