suggesting single quotes by default in javascript

I brought this up in hipchat a few weeks ago, and there seemed to be no one who was violently opposed to changing this style point.

Is everyone cool with this?

Reasons:
- consistency with python
- fewer characters

Reasons not to:
- I couldn't think of any
hmmm yeah looking at the python spec I guess we don't specify it. But I've certainly seen mostly single quotes in the python codebase