mk: add missing environment exports to make eclipse-projects of dry packages build

Signed-off-by: Ruben Smits <ruben.smits@intermodalics.eu>
mk: cleanup catkin generated files/directories after make eclips-project

Signed-off-by: Ruben Smits <ruben.smits@intermodalics.eu>
remove unnecessary usage of unicode strings (fix #12)