updated user schema to make github_id available in the app

Author: smeidan

lib/models/user.js

@@ -51,7 +51,8 @@ UserSchema
     return {
       'name': this.name,
       'role': this.role,
-      'provider': this.provider
+      'provider': this.provider,
+      'github_id': this.github_id
     };
   });