Fix multi-command handling and add tests #12
Merged
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Addresses issue reported in https://cms-talk.web.cern.ch/t/issue-with-command-to-run-in-cmssw-cc7-singularity/32815/, while still allowing the use of arguments not surrounded by quotes in the single-command, multi-argument case.
Adds tests for various behavior, including the tests used in #3 and #4. Also fixes the "standalone" (non-cvmfs) case, which had been inadvertently left broken in #4.