Add unit testing via BATS#18

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erikvip wants to merge 2 commits intonk412:masterfrom

erikvip:v1_add_unittests

Commits on Jun 3, 2016

Inital unit testing. Adds support for testing with BATS. Adds documenation for contributors about running tests.
erikvip
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Updated unit tests for compatibility with nk412/optparse for pull request. Moved the nounset test to bottom, and removed default value with spaces, which are addressed in seperate pull requests. We…
erikvip
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