Merge pull request #296 from ianunruh/master

Made client optional for password grant type
Remove application.js from layout

This causes errors in production mode as application.js does not exist.
Merge pull request #312 from szechyjs/patch-1

Remove application.js from layout
Update Revoke all to revoke tokens, not delete them.
Move method up.
Since the action is the same for all ORMs, move it up into the access_token class.
Merge pull request #313 from bryanrite/revoke_do_not_delete

Update Revoke all to revoke tokens, not delete them.
Resolve test warnings

Signed-off-by: Phill Sparks <phill@crowdlab.com>
Merge pull request #316 from crowdlab-uk/feature/rails4-test

Resolve test warnings for Rails 4