Page should display a suitable message when Javascript is disabled

[mikelittle]

Issue Description

When the browser has JavaScript disabled, the page shows as blank. Or, if logged in, only the admin bar renders.
Instead it should show a message to let the user know that JavaScript is required and they might have it turned off.
Here is what BaseCamp does

This is usually implemented with some HTML message on the page which is then removed as soon as JS executes. If JS doesn't run, the message stays in place.

Steps to reproduce:

1. Turn off JavaSCript in the browser. I use Web Developer extension by Chris Pederick http://chrispederick.com/work/web-developer/chrome/
2. Visit an H2 blog
3. Observe the blank page

Expected Result:

A message informing the user there is no JavaScript and that it is required should be displayed.