Put more information about the conference on the home page.

A lot of it was cribbed from Sandro's email to the mailing list:
http://www.meetup.com/london-software-craftsmanship/messages/64211812/
Minor grammatical edit.
Put more information into the agenda.
Merge pull request #1 from lscc/more-info

Put more information about the conference on the home page.