small changes to person detection
Merge branch 'master' of https://github.com/utexas-bwi/bwi_experimental into jivko_branch
continued work on people detector
small change
Merge branch 'master' of https://github.com/utexas-bwi/bwi_experimental into jivko_branch

Conflicts:
	pcl_perception/src/background_person_detector.cpp
minor code improvements
small changes to launch file
Merge branch 'master' of https://github.com/utexas-bwi/bwi_experimental into jivko_branch