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travis-ci

Exit with non-zero code on single run error (#25)

* Buildfix: explicitly upgrade setuptools

With 2.7 required, both builds for 3.x and 2.x failed with following error
"
VersionConflict
(setuptools 12.0.5
  (/home/travis/virtualenv/python3.4.2/lib/python3.4/site-packages),
  Requirement.parse('setuptools>=30'))
"

* Exit with non-zero code on single run error

If flag --once is specified, and some error occurs exit with
code 1.
Additional test for main function.

14 of 14 new or added lines in 1 file covered. (100.0%)

154 of 154 relevant lines covered (100.0%)

2.0 hits per line