Add support for "token" as authorization response type

[diekaines]

Hi All

This is the same issue as #26 but that was closed without being fixed.

Thank you

[j0k3r]

I just took a look about that and everything is ok to use token.
When you are using token as response type, Imgur will return all information to define the access token.

// request your access token data
require_once 'vendor/autoload.php';

$client = new \Imgur\Client();
$client->setOption('client_id', 'xx');
$client->setOption('client_secret', 'xx');

echo '<a href="'.$client->getAuthenticationUrl('token').'">Click to authorize</a>';

In return, you'll get an url like:

https://imgur.com/#access_token=xx&expires_in=315360000&token_type=bearer&refresh_token=xx&account_username=test&account_id=1

Then you just need to define the access token using (it's your choice on who you retrieve data from the url):

$client->setAccessToken([
    'access_token' => 'xx',
    'expires_in' => '315360000',
    'token_type' => 'bearer',
    'refresh_token' => 'xx',
    'account_username' => 'test',
    'account_id' => '1',
]);

And you'll be fully authenticated.
You don't need to call requestAccessToken when using token as response type.