Setup/Tryout JSDoc

The default template is pretty ugly and I didn't spend too much time worrying about the output which is why a lot of things are labeled "global".

We can create a custom template for it, I whipped this together quickly with bootstrap: http://jsfiddle.net/thejameskyle/xdNza/embedded/result/

I was doing this as an experiment to see how we like jsdoc. So that we can decide if we want to invest time into using it for Marionette.

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Just run `grunt docs` and open one of the files in the `doc` directory in your browser.