fix(docs): Add summary and options in settings of login

Author: VincentM

lib/ionic/login.js

@@ -12,6 +12,11 @@ var appLibSettings = IonicAppLib.settings;
 var settings =  {
   title: 'login',
   name: 'login',
+  summary: 'Login to your Ionic account',
+  options: {
+    '--email|-e': 'Ionic account email',
+    '--password|-p': 'Ionic account password'
+  },
   isProjectTask: false
 };