Initial draft for InMemory/AccessToken for using resource endpoint direct with remote debug endpoint without complete ORM backend.
Complete Model/InMemory/*, update debug endpoint to just check access_token/debug_token provided.
Merge branch 'release/2.1.0' of github.com:authbucket/oauth2 into release/2.1.0

Conflicts:
	src/AuthBucket/OAuth2/Model/InMemory/AbstractModelManager.php
	src/AuthBucket/OAuth2/Model/InMemory/AccessTokenManager.php
	src/AuthBucket/OAuth2/Model/InMemory/ModelManagerFactory.php