Revert r2376 since it's not needed as discussed in Issue 188.
http://code.google.com/p/soc/issues/detail?id=188
Patch by: Pawel Solyga
Reviewed by: to-be-reviewed
# 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: /