Updates max effort to allow robot to stand when on ground.
Adds geting joint positions to c++ tars_control_lib
Python tars_control_lib_py : better handling of unavailable services.
Python example handles unavailable service.
Adds tars_controller_nn and updates tars_sim to have example UI window.
Merge branch 'master' of https://github.com/dbrody/tars_robot_sim
Updates readme