Code cleanup

As a light exercise for a Sunday evening, I've made some code clean up involving mainly the removal of unused imports, stale looking code/comment parts, and some trivial PEP8 changes (adding/removing white spaces).

This PR builds on #47, since a significant amount of code was removed in that. Once that one is merged, I'll rebase this one to make the review easier.
The second line should be indented so the start quotes match.