Patrick

1. Update existing push env to use cartesian action space 2. Add new pushing envs 3. All pushing envs use robotiq gripper. See additional PR here for gripper updates: https://github.com/vikashplus/robotiq_sim/pull/1

Please also see following PR for bin used in this environment: https://github.com/vikashplus/furniture_sim/pull/2 As well as this PR for updated robotiq gripper: https://github.com/vikashplus/robotiq_sim/pull/1

Add a bin with low height and sloped sides