Merge pull request #17 from fschlimb/master

Enable Travis using make_kit.py and mpich
Update README.md
Merge pull request #18 from fschlimb/master

Builds with OpenMPI but hangs in wait()
Merge pull request #19 from fschlimb/master

Fix for debug output when shutting down
Merge pull request #20 from fschlimb/master

enable testing with travis, added raytracer
Merge pull request #1 from icnc/master

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