Avoid accessing Token class directly

[lucasctd]

In AccessTokenController class you access the Token model directly (see below). You should avoid doing this since Laravel provides the Passport::token() where you can get the instance of the Token model.

So, instead of doing like above you should:

$query = Passport::token()->where('user_id', $token->user_id)->where('client_id', $token->client_id);
It's very important since, like in my case, people may be using a different implementation of the model.

[lucasctd]

I have opened a the #96 PR with the updated code. =D