First release

Full Changelog: https://github.com/HoangGiang93/mujoco_sim/commits/v1.0.0

This version supports:

• Import and export of URDF and MJCF
• Integration of controller interfaces, controller managers and hardware interfaces from http://wiki.ros.org/ros_control
• Integrate PD computed-torque control to ensure stability
• Spawn objects in run-time
• Synchronize simulation time and real time (the simulation time can also be set to speed up or slow down)
• Visualize everything from Mujoco to rviz