Removed fetch and parsing of urdf from param server

... since now it's given in the arguments of initSim.
Merge pull request #1 from bmagyar/patch-1

Removed fetch and parsing of urdf from param server
reemc_description: remove unused robot models

These models should not be here. The urdf files should
be generated by xacro from the files from reemc_description
Merge pull request #2 from po1/rm-robot-model

reemc_description: remove unused robot models
boost::shared_dynamic_cast --> boost::dynamic_pointer_cast