upgrade doorkeeper gem
include missing controller modules 

since https://github.com/doorkeeper-gem/doorkeeper/commit/36c110748d22a0a9e65da3ea190d2118aee11fed doorkeeper tokens_controller is bare metal.
Update paper_trail and deps.
Merge pull request #151 from astopy/gem-update

Update paper_trail and deps.
Tidy up Dockerfile.
Add start.sh for Docker and use production by default.
Merge pull request #150 from astopy/master

Docker deployment updates
Add DB migration script for production deployment.
Merge pull request #152 from astopy/master

Add DB migration script for production deployment.
Merge pull request #149 from camallen/gem_upgrades

upgrade doorkeeper
Add /links routes
Add Middleware to reject PATCH requests
Modify User Controller and Spec to only handle puts
Convert Controllers to handle strong parameters strictly

Reject requests if they use parameters not whitelisted with a 422.
Add update methods module
Create Destructable mixin and specs
Fix OAuth Controller specs
Partial Deactivatable Concern