updated VENDORS for 2.1.6
fixed 2.1.6 composer.lock file
Add description about the upgrade of app/appKernel.php
Merge branch '2.1'

* 2.1:
  Add description about the upgrade of app/appKernel.php
  fixed 2.1.6 composer.lock file
  updated VENDORS for 2.1.6

Conflicts:
	composer.lock