Revert "Adjusting Travis CI apt dependencies."
Revert "Adjusting Travis CI apt dependencies."

This reverts commit 980258a6e58af20cf20dd77a7e327aafd66ebb5f.

Exodus apparently needs Fortran, and Travis CI doesn't fancy libopenmpi-bin.

jjphatt/polyglot-dev,jjphatt/polyglot-dev,polymec/polyglot-dev,polymec/polyglot-dev,jjphatt/polyglot-dev,polymec/polyglot-dev