#124 makes sure tests work on fresh workspace
#124 makes sure tests work on fresh workspace

Currently the tests don't work on a fresh checkout (if no
`paths.compareConfigFileName` exists). The check whether a config has
been changed should only fail if a compareConfig exists and
contains a different checksum than the `paths.activeCaptureConfigPath`'s
checksum

garris/BackstopJS,cookchristopher/BackstopJS,klausbayrhammer/BackstopJS,cookchristopher/BackstopJS,klausbayrhammer/BackstopJS,garris/BackstopJS,mirzazeyrek/BackstopJS,garris/BackstopJS,mirzazeyrek/BackstopJS