Fix for EZP-20930: missing REST root resources

http://jira.ez.no/browse/EZP-20930

Adds the missing URLs to the REST root resource.

Adds a dependency on https://github.com/hautelook/TemplatedUriBundle that allows us to generate RFC-6570 compliant URIs through a custom router. We currently require a fork since the original is marked as not compatible with Symfony 2.3 (it does work though).

Another fix is currently in the fork: it is required to skip value constraints on some parameters, like objectStateGroupId, since we require an integer value, but the RFC uses a string for named parameters. A PR will be sent to the author to evaluate if this brutal fix makes sense.