Launch file To Dos

[dhood]

• Launch file params for topics could be remaps instead
  Perhaps it's not necessary for the launch file to take the topics as arguments: remapping might be sufficient.
• Launch nodes on Nao from the launch file on the computer
  roslaunch can start nodes on different machines, and maybe the nao_learning launch file could launch nao_bringup on the robot, for example.
• Make the RViz settings read from the params set in the launch file
  The nao_learning launch file has a parameter for the camera frame ID, and it would be nice if when RViz opens it could already be displaying the image from the camera frame specified, for example.
• Fix how RViz only loads black screen ~50% time
  On at least two computers used during development, RViz often starts with a black window where the display (grid, robot, etc.) should be.