Breaking Change: shopify\access_token()

 now directly returns the oauth access token.

Author: sandeepshetty

Diff for: shopify.php

@@ -40,10 +40,12 @@ function access_token($shop, $api_key, $shared_secret, $code)
 	{
 		try
 		{
-			return http\request("POST https://$shop/admin/oauth/access_token", array(), array('client_id'=>$api_key, 'client_secret'=>$shared_secret, 'code'=>$code));
+			$response = http\request("POST https://$shop/admin/oauth/access_token", array(), array('client_id'=>$api_key, 'client_secret'=>$shared_secret, 'code'=>$code));
 		}
 		catch (http\CurlException $e) { throw new CurlException($e->getMessage(), $e->getCode(), $e->getRequest()); }
 		catch (http\ResponseException $e) { throw new ApiException($e->getMessage(), $e->getCode(), $e->getRequest(), $e->getResponse()); }
+
+		return $response['access_token'];
 	}