v0.6.0

• In previous versions, ZfrOAuth2 would trigger an "InvalidAccessTokenException" if you'd try to call the getToken when no token was specified in either Authorization header or query param. Now, ZfrOAuth2 will simply return null (because no token was explicitly set). However, this exception will be trigger IF an access token is indeed given, but does not exist in your database, is expired or does not match scopes.