adjusted map size for gmapping to 25

-Use new filter settings

Merge branch 'master' of https://github.com/tu-darmstadt-ros-pkg/hector_turtlebot

-New scan filter configs

Merge branch 'master' of https://github.com/tu-darmstadt-ros-pkg/hector_turtlebot

changed map extends - need to check if i really changed the right params

moved position of asus xtion

extended map radius

-Add camera xacro file for working around the fact that generic camera plugin doesn´t work in hydro

-Add launch files for hector_mapping

-Add asus xtion cam for the moment

-Fix xacro warning

-Remappings so things work in gazebo

-Add basic navigation launch files

-Add hector_turtlebot_scan_filter