Remove redundant module include
Merge pull request #439 from edpaget/rename-application-controller

Rename application controller
explicit doorkeeper namespace declaration

If a constant is already loaded it will be used, e.g. Rails loads ApplicationController and the module declaration uses this instead of the Module namespaced one.
Merge pull request #440 from camallen/rails_autoload_namespaces

explicit doorkeeper namespace declaration
TokensController and TokenInfoController inherit ActionController::Metal
Merge pull request #443 from jasl/refactor-controllers

TokensController and TokenInfoController inherit ActionController::Metal
Update CHANGELOG. [ci skip]
Releasing version 1.4.0. [ci skip]
Removes deprecated test_redirect_uri
remove warn_if_using_mount_method!
Merge pull request #446 from jasl/remove-routes-deprecates

remove warn_if_using_mount_method!
Update tokens_controller.rb

To learning English...
Merge pull request #447 from jasl/patch-1

Update tokens_controller.rb
dropping legacy doorkeeper_for and welcome doorkeeper_authorize!
Merge pull request #448 from jasl/new_filter_api

dropping legacy doorkeeper_for and welcome doorkeeper_authorize!
Undo behavior change on specs.

See
https://github.com/doorkeeper-gem/doorkeeper/pull/448/files#diff-403546b64759d2fcb933e8345a827403L2.
Update CHANGELOG. [ci skip]
README notifies that docs may differ per version.

[ci skip]