Introducing Backbone Radio post

@jdaudier your post for BB.radio provided a good overview of Radio, but I'd like to give folks a more in-depth look at Wreqr, Radio, and our decision to replace the library. So I wrote this blog post about it.

Feedback appreciated!
@thejameskyle that would be cool. And then maybe add in a configuration in the config.yml file like `filter_by_author: true`
And when you set that to true, it behaves like a tag so you can filter by it.