Add new gripper model

talos_description/meshes/gripper/gripper_motor_double.STL

...ription/meshes/gripper/gripper_motor_double_collision.STL

talos_description/meshes/gripper/gripper_motor_single.STL

...ription/meshes/gripper/gripper_motor_single_collision.STL

talos_description/meshes/gripper/inner_single.STL

talos_description/meshes/gripper/inner_single_collision.STL

talos_description/meshes/torso/torso_1.STL

talos_description/robots/talos_gripper.urdf.xacro

talos_description/robots/upload_gripper.launch

talos_description/urdf/gripper/gripper_v2.urdf.xacro