pass error objects instead of strings
rework the buildPayload code to early return
Merge pull request #3 from lightsofapollo/use-error-objects

Use error objects
version bump
readable streams as file option
Merge pull request #4 from niclashoyer/read

readable streams as file option
version bump
Merge branch 'master' of https://github.com/apocas/docker-modem