Add .gitignore.
Fix JSON syntax error in default settings.

ST2 complained about this at startup. It didn't seem to bother ST3.
Remove leftover debugging print statement.
Fix #1: Python 2 (ST3) compatibility issue.

I had clearly never tested this package on ST3. The urllib.quote
function moved to urllib.request.quote in Python 3. This commit fixes it
to work in ST2 and ST3.