Merged sick s300 driver into scitos_mira package

Since the laser is an essential part of the robot drivers, I merged the sick s300 drivers from: http://ais-bonn-ros-pkg.googlecode.com/svn/trunk/stacks/ais_bonn_drivers/sicks300 into the scitos_mira package. This prevents the problem of finding the laser drivers and setting the ROS_PACKAGE_PATH manually in order to do so. Additionally, it simplifies the build process because the drivers are now built with the rest of the scitos drivers when invoking catkin_make.
In order to merge the project the svn project had to be transferred into a git repository and was catkinized afterwards. The only problem is that it might not be easy to update the sources from the original svn but it has not been updated for over 2.