Added support for Sublime Text 3

- Mostly involved replacing `%` operator with new `.format`
- Added a `.gitignore` because I'm picky
- Removed compiled `.pyc` because it doesn't matter.
Minor update to README. Support for Sublime Text 3
Merge pull request #8 from oliverseal/master

Needed this today in ST3, so I just did it. Easy stuff. Just needed formatting.