[12gevmoller_sim] [JeffersonLab/remoll] 47bff8: Exit out with error code on first test failure

[Wouter Deconinck]

  Branch: refs/heads/bugfix-issue-199
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  Commit: 47bff827f2fdf45f30e8dd01bd93402714856175
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  Author: Wouter Deconinck <wdconinc at gmail.com>
  Date:   2019-02-25 (Mon, 25 Feb 2019)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  Exit out with error code on first test failure

Without this, the loop over unit, commit, release test_macros tries
to continue and can succeed on the remaining categories.