refactoring of repository:
* added stuff to catkinise this repository (now strands_morse is the package, everythnig else is contained in it)
* the policy is that different environments can go into different subdirs (simulator.sh takes care of setting everything up)
* changed simulator.sh to set PYTHONPATH etc and removed this from the specific builder scripts
* move all non-simulation code (strands_executive) into subfolder TO-BE-MOVED for now
* created new environment tum_kitchen
* put everything that is common into strands_sim (robots, scripts, etc), make sure other environments can find what is in strands_sim
moved simulation urdf file into strands_sim/robots
added removal of file
moved 2dnav out of sim repository
added missing resource path
Merge pull request #8 from marc-hanheide/master

Refactoring and catkinising of simulation to support multiple environments more transparently

WARNING: There are currently no launch files for the 2D navigation in simulation! That is, if you don't need the new repository structure by now, please wait until the launch files are in place.