Update the inflector api

[pkly]

A lot of deprecated errors are thrown during usage of the bundle with message:

The "Doctrine\Common\Inflector\Inflector::camelize" method is deprecated and will be dropped in doctrine/inflector 2.0. Please update to the new Inflector API.

in file /Mapping/Caser.php:30 { return Inflector::camelize($string); }