Remove register_globals option in php.ini

This option has been removed since PHP 5.4

Update Dockerfile

Fixes #49 and #55

Applied fixes from StyleCI

Update dependencies

Standard Edition for v2

Update the Docker configuration

Use 2.3 for behatch/contexts

Expose the Link header (Hydra doc)

Delete entity AppBundle\Entity\Thing

Add a Gitter chat badge to README.md

Fix behatch version

A bug make the behat scenarios throw an error in the version 2.1.*
of behatch/contexts. Due to the removing of the later tags 2.2 and
2.3 as referenced in the issue behatch/contexts#126, the dependency
is set to dev-master for the moment.

Closes #13

Init Docker environment

fixed url of DunglasApiBundle

just a little typo :)