Merge pull request #22 from ethz-asl/fix/install-include

Fixed a bug in the install target for include directories
Added automatic installation of roslaunch files with cs_install() macro if a launch folder exists in the source directory
cs_install() installs shared content folders
* launch, rviz, urdf, meshes, maps, worlds, media and param
Add informative cs_install() cmake output.
Merge branch 'feature/install_roslaunch_files' of https://github.com/ethz-asl/catkin_simple into ethz-asl-feature/install_roslaunch_files
[style] remove trailing whitespace
only install Media, not media, automatically
Merge pull request #3 from catkin/master

Merge automatic installation of commonly used folders by cs_install()