shared_serial: added documentation and launch files


git-svn-id: https://svn.3me.tudelft.nl/dbl-ros-pkg/catkin/shared_serial@2191 307b8eea-87bc-4b2c-8ed6-ec76be046bab
Added changelog
0.2.0
Merge branch 'master' of https://github.com/wcaarls/shared_serial