Adding HyQ robot
This PR creates a function for loading the HyQ robot. The URDF model is defined inside hyq_description which is a submodule in this repo.
There are few task to be done yet:
- Create a hyq-data repository and remove the submodule
- Create a SRDF for HyQ
- Modify the loadHyQ according to the new SRDF
@rbudhira could you help me to create the SRDF?