IoC::registered check fixed

Returns true if the instance was registered with IoC::instance
Merge pull request #1875 from effenberger/master

modified IoC::registred()
Upgrade to latest Symfony HttpFoundation tag. Closes #1865.
Update migrator.php

when used in a setup task. The output created didn't add a line ending.
Fix method override.
Merge pull request #1959 from dotramses/patch-1

Update migrator.php
Merge branch 'master' into master-with-fixes