Update copyright dates in the footer, add a summary to the top of feb20.

Per prior discussion in #bitcoin-dev, give the feb20 a tldr message
at the top. Also add a world clock link.

_layouts/base.html

@@ -37,7 +37,7 @@
       <footer>
         <div class="inner">
             <p>
-              &copy; Bitcoin Project 2009&ndash;2011<br/>
+              &copy; Bitcoin Project 2009&ndash;2012<br/>
               Released under the <a href="http://creativecommons.org/licenses/MIT/">MIT license</a>
             </p>
           </div>

feb20.html

@@ -4,6 +4,8 @@ layout: simple
     <div class="container">
       <section id="feb20">
         <h1>February 20, 2012 Protocol Changes</h1>
+        <h4><b>Summary:</b> Nothing is required of you right now. In the unlikely
+        event that something breaks on/after February 20th, come back here.</h4>
 	<p>
 In June 2010 the Bitcoin reference software version 0.2.10 introduced
 a change to the protocol: the 'version' messages exchanged by nodes
@@ -13,7 +15,8 @@ values to detect corruption by broken networks.
 All other messages already carry a checksum (for connections between
 nodes 0.2.9 and later) but the version messages themselves could not
 be changed in a compatible way, so this change was delayed and does not take effect until
-Midnight UTC on Feb 20th 2012 to leave users time to upgrade.
+<a href="http://www.timeanddate.com/worldclock/fixedtime.html?msg=Bitcoin+protocol+change&iso=20120220T00">midnight UTC on Feb 20th 2012</a>
+to leave users time to upgrade.
 </p><p>
 The developers of the Bitcoin reference software are unable to find
 any evidence of any nodes still running software prior to 0.2.10 on
@@ -29,5 +32,8 @@ time.
 If there are unexpected difficulties this page will be updated with
 relevant information.
 </p>
+<div style="text-align:right">
+<i>This notice last updated: Sun Feb 19 03:34:40 UTC 2012</i>
+</div>
 </section>
 </div>