Initial implementation of friend chat

@mikeymurph77 @ChristopherThorsen 
How about putting each of these on separate lines? They won't be in the HTML, but it'll be a lot easier to read:

```html
<p>
  <%= message.body %>
  >>> 
  <%= message.sender.name %> 
  >>> 
  <%= time_ago_in_words(message.created_at) %> ago
</p>
```