enchansment of db message source
Update MessageController.php

fix code style
add findAndModify() method to the Collection class
Update MessageController.php
Update MessageController.php
Add unit tests
Merge pull request #2613 from mongosoft/mongodb

add findAndModify() method to the Collection class
Merge pull request #2607 from mitalcoi/db_message_source

enchansment of db message source
Changelog for #2607
Removed executable flag from asset files
Removed unused variables