basic tag support

[Russ Frank]

it seems like lots of people like to use <pre> tags instead of the appropriate markdown syntax. Maybe we could add some basic support for this so we workaround ugliness like

   Request -- Simplified HTTP request method

   Install

<pre>
  npm install request
</pre>

      Or from source:

<pre>
  git clone git://github.com/mikeal/request.git 
  cd request
  npm link
</pre>

   Super simple to use

      Request is designed to be the simplest way possible to make http calls. It support HTTPS and follows
      redirects by default.