Added scope prop

Author: Ignacio

lib/providers/google.js

@@ -22,7 +22,7 @@ import {
   toQueryString,
 } from '../utils/uri';
 
-const SCOPE = 'email profile';
+const SCOPE = 'email profile offline';
 const AUTH = 'https://accounts.google.com/o/oauth2/v2/auth';
 const TOKEN = 'https://www.googleapis.com/oauth2/v4/token';
 const ME = 'https://www.googleapis.com/oauth2/v2/userinfo';
@@ -45,13 +45,13 @@ const getUser = curry((request, credentials) => pipe(
   ),
 )(credentials));
 
-export const authorize = ({ dance, request }, { appId, callback }) =>
+export const authorize = ({ dance, request }, { appId, callback, scope = SCOPE }) =>
   pipeP(
     dance,
     fromQueryString,
     checkError,
     merge({ appId, callback }),
-  )(authorizationUrl(AUTH, appId, callback, SCOPE, 'code'));
+  )(authorizationUrl(AUTH, appId, callback, scope, 'code'));
 
 export const identify = curry((request, { appId, callback, code }) =>
   pipeP(