Removed useless folder

Instead of a folder with code in its __init__.py, "juju" is now a proper
python file.
Fixed typoes

Also added a quick ownership tag for a FIXME (it wasn't immediately
obvious who "I" was refering to)
Removed magic numbers from step_info invocation

The method defined never-used defaults, and the only invocation passed
in different magic numbers. Now the default numbers are the ones that
are used.
Moved the magic defaults to GUI

As requested.
Moved FIXME to relevant place.
Merge pull request #230 from chrisglass/random-fixes

Looks good, thanks!