fixes safe bug, adds some drawing controls
A tiny bit of cleanup
Merge pull request #28 from jbbrokaw/bugsquash

Bugsquash
Added defaults for all steps, 2nd image
Merge branch 'master' of https://github.com/jbbrokaw/telephone-project into default-images
Merge pull request #29 from jbbrokaw/default-images

Default images
useful message
change docstring