Fix a regex pattern of Google-Auth form.

form/admin/google.js

@@ -4,7 +4,7 @@ var form = require('express-form')
   , field = form.field;
 
 module.exports = form(
-  field('settingForm[google:clientId]').trim().is(/^[\d\.a-z]+$/),
+  field('settingForm[google:clientId]').trim().is(/^[\d\.a-z\-\.]+$/),
   field('settingForm[google:clientSecret]').trim().is(/^[\da-zA-Z\-]+$/)
 );