migrating to gazebo_ros_pkgs
fixed cmake and launch errors for gazebo_ros_pkgs migration
catkinization complete
fixed bwi_test_world to work with gazebo_ros_pkgs for hydro transition
upgraded test world to SDF 1.4
removed redundant lines of code and added segbot_navigation for a complete navigation solution launch file
changing launch file permissions to execute
added complete navigation solution
removing fake amcl, as an upstream version exists somewhere