Sample .jshintrc

I've added the [example `.jshintrc`](https://github.com/jshint/jshint/blob/2.x/examples/.jshintrc) from the jshint project repo. A good amount of information is included inline here, but if you want more info you can check out their [docs](http://jshint.com/docs/options/).

In a separate commit, I've changed a few of the rules to match what I think are the current conventions for many component projects, or at least what has been expressed in the style guide PR. (so you can see the diff via github)

I've avoided the more opinionated ones, like `maxparams` and the other `max*` options pending further discussion.