Fix Docker setup and add Travis setup

Update dependencies

Better default parameters

Update composer.json

Fix vhost conf

Fix the xml schema of the vhost.conf

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

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)