- Added a favicon.ico to save some 404s
Performance enhancements

I am concentrating on reducing CPU usage for this checkin. I've managed to
get load down dramatically with these enhancements and with running more
fastCGI threads. I can now leave this running for 5 minutes without cloudflare
and not see the load go beyond .5.

- Pulled in HTML::TreeBuilder::LibXML which reduces our CPU usage a little
- Swapped in LWP::Protocol::Net::Curl, which made a large difference to CPU usage
- LWP::ConnCache now has total capacity set to 5; this may be worth playing with
  for additional performance boost
- Removed LWP::Simple, unused