added launch files pkg
switched definition of distance sensors
modified world code to put an actual wall
fixed location of dist sensors, added rviz config file
fixed distance sensor location and wall distance computation
added lifetime to sensor markers to allow them disappear
fixed distance sensor height
changed distance sensor msgs to adc, remapped topics
Merge pull request #3 from fevb/hydro-2014

fixed wall & sensors, added adc msg for distance sensors, added launch file package