Wrap publish date and project version into named <span>'s

Example output of the site renderer:

<div class="xleft">Last Published: 2008-07-26 &nbsp;| Version: SNAPSHOT</div>

This can make styling via CSS difficult:

• designer cannot apply different styles to date and version and
• more importantly designer cannot apply different styles for date/version and the separators (e.g. to hide them)

Hence I propose to add <span id="..."> around publish date and project version to make them accessible for CSS.