Adding several uol environments without cameras to make simulation quicker.
* Added human_pose_simulator to launch file
* Small changes to human_pose_simulator to work with and without semantic camera
 * in wire frame mode the semantic camera doesn't really work. Therefor visible defaults to true if there is no semantic cam info coming in.
 * moved output to debug.
Merge pull request #88 from cdondrup/no-cameras

Added several environments without cameras to speed up simulation