message: Update release_notes.html
  Make note of ubuntu 12.04 end of life
diff: <dl>
  <dt><a href="configuration#standby">Standby</a> has replaced <a href="configuration#on_off">Off</a></dt>
  <dd>Pagespeed off has been deprecated and replaced with pagespeed standby.</dd>
  + <dt>Ubuntu 12.04 end of life</dt>
  + <dd>The platform used to build .deb files has moved to Ubuntu 14.04. This introduced a dependency
  + on a glibc version which is not compatible with Ubuntu 12.04. Building from source is still possible.
  + </dd>
  </dl>
  <h3 class="hide-from-toc">Issues Resolved</h3>
  