Add release tag string, Melange "badge" image, and Google App Engine version
to base.html template.
Patch by: Todd Larsen
# Directions for web crawlers.
# See http://www.robotstxt.org/wc/norobots.html.
User-agent: HTTrack
User-agent: puf
User-agent: MSIECrawler
User-agent: Nutch
Disallow: /