Make it go

[Sleavely]

• getAuthorizationHeaders() requires overloading because AbstractProvider does not provide a default value. Otherwise any requests post-authentication (through getAuthenticatedRequest()) wont work.
• createResourceOwner() should at least return the response array for getResourceOwner() to work decently. Though, in a perfect world where I wasn't lazy it would return something that implements ResourceOwnerInterface

[davidcole1340]

Sorry, didn't see this until now. Thanks!