Changed openni_robot.launch

This is changed because old version can't be launched becuse now openni driver uses nodlets and old node doesn't exist any more. This is my proposal with full functionality like previous one.
Add new example with tod pipeline using ros.
Changed launch files to work with new example. So now user can use tod with ros out-of-the-box.
Corrected small error in last commit.
Merge pull request #4 from destogl/ros_example_code

Ros example code