v5.6.0.rc1

• [#1551] Change lazy loading for ORM to be Ruby standard autoload.

• [#1552] Remove duplicate IDs on Auth form to improve accessibility.

• [#1542] Improve performance of Doorkeeper::AccessToken#matching_token_for using database specific SQL time math.

  [IMPORTANT]: API of the Doorkeeper::AccessToken#matching_token_for method has changed and now it returns
  only active access tokens (previously they were just not revoked). Please remember that the idea of the
  reuse_access_token option is to check for existing active token (see configuration option description).