Server-side rendering

[jchitel]

Right now we are just returning raw HTML from the server. We can use server-side rendering instead, so the server will actually be calling into the client. This has pretty heavy implications, and is where a Next-like design will need to come into play.

• We need document, head, and body components
• We need the ability to fork client vs server logic in our components (akin to getInitialProps()). Next prefers a fully isomorphic setup, but we want to be able to see a clear separation between what code is running on the client vs the server.
• Combining the above two points together, we need to do what Next does to bootstrap a React component tree into a React rendered document. This will be complicated (and fun).