[Starts #42398959] Beginning tests for administrating avatars
Adds edit form to update avatars

It's not possible to submit the edit form, but it's present.
Removes stragling focus tags
Adding update method to avatars controller
Initial, simple avatar request specs
Refactors facebook integration tests
Adds a link to navigate to the avatars administration
Refactors facebook specs
Refactors facebook tests
Improve avatar acceptance testing
Improves avatar tests
Merge pull request #20 from ekampp/features/administrate_avatars

[Completes #42398959] Allows administration of avatars