remove direct references to command_line
template workingDirectory into test data
treat error callbacks like failure
pin flask-restful dep to pass tests
Merge pull request #62 from mark-burnett/fix-sc-jsonschema

Bring up to date with current shell-command API (closes #61)
Pin requirements
Remove python-statsd requirement
Migrate from simplejson to json
Update badges
Merge pull request #64 from iferguson90/pin-requirements

Pin requirements