Merge pull request #102 from wxmerkt/topic/add-unitree-a1

python/example_robot_data/robots_loader.py

robots/a1_description/README.md

robots/a1_description/meshes/calf.dae

robots/a1_description/meshes/hip.dae

robots/a1_description/meshes/thigh.dae

robots/a1_description/meshes/thigh_mirror.dae

robots/a1_description/meshes/trunk.dae

robots/a1_description/meshes/trunk_A1.png

robots/a1_description/srdf/a1.srdf

robots/a1_description/urdf/a1.urdf

unittest/test_load.py