Remove doctrine/orm after roave update

[pinclau]

We currently put doctrine/orm in composer to ensure minimum version of 3.2.
Currently roave/psr-container-doctrine request a minimum v 3.0, and that version has some bugs.
If roave/psr-container-doctrine updates to a minimum doctrine/orm 3.2, we can remove it from composer

[arhimede]

https://github.com/Roave/psr-container-doctrine version 5.2 is about to be released, and require orm 3.2