write catkin_package() in correct place and delete pcl depent from package.xml
Merge branch 'hydro-devel' of https://github.com/PR2/pr2_navigation into modify-CMakelists-and-packages
delete unneeded lines
Merge pull request #6 from aginika/modify-CMakelists-and-packages

put catkin_package() before add_executable and add_library , delete pcl depend form package.xml