pcl: initial commit
pcl-conversions: initial commit
pcl-ros: initial commit
depth-image-proc: initial commit
navigation: initial commit

This commit includes all navigation packages except robot_pose_ekf.
The robot_pose_ekf requires bfl, which we could not provide yet.
Merge branch 'pcl-v4' of https://github.com/bulwahn/meta-ros into freenect-stack
freenect-launch: first commit
rgbd-launch: first commit