Loading URDFs and SRDFs from example-robot-data
In this PR I used the example-robot-data repository for loading Talos and HyQ robots.
Missing stuff before merging
- Binary release (in robotpkg) of example-robot-data.
- Modify the Dockerfile in order to load this repository.
Note that at the time being we are using these models for unit-test, so we need to do (2). However we should use simple models for unit-testing in order to align with team policy.