added CONTRIBUTORS file

This is the excellent group that took Switchboard to its
initial release.
updated faq to address lamson+smtp Qs
Merge pull request #30 from jtmoulia/hn-doc-fixes

Updated faq to address Lamson and SMTP questions.
fixed address cleaning function
Merge pull request #31 from jtmoulia/clean-addresses-fix

Fixed address cleaning function