add new program: pointcloud_cropper to crop pointcloud with interactive marker
Merge remote-tracking branch 'refs/remotes/origin/master' into pointcloud-cropper

Conflicts:
	jsk_interactive_markers/jsk_interactive_marker/CMakeLists.txt
fix malformed manifest.xml of jsk_interactive_marker
decrease the number of cpu to be used on travis
Merge pull request #132 from garaemon/pointcloud-cropper

add new tool: pointcloud_cropper to crop pointcloud with interactivemarker