[travis] adding travis config again
[travis] adding travis config again

Still a little rudimentary as it only builds with GCC 5.2 without
MPI.

Signed-off-by: Torbjörn Klatt <874eb11690ea5d8427c1f32853e3244a26aae295@fz-juelich.de>

memmett/PFASST,memmett/PFASST