spec: rails3 models/profile_spec

Change-Id: Ida45760eb86aca62a64e1c05c092ab23d5e88b2e
Reviewed-on: https://gerrit.instructure.com/29662
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Cody Cutrer <cody@instructure.com>
Product-Review: Jon Willesen <jonw@instructure.com>
QA-Review: Jon Willesen <jonw@instructure.com>