Merge pull request #7 from evanmiller/master

Update Daniel C. Jones photo by request
adding code of conduct
remove reference to people to contact, for now
list some nearby hotels
Merge pull request #9 from JuliaCon/jjp/hotels

list some nearby hotels
Merge pull request #8 from hunterowens/gh-pages

Code of Conduct.
add Stefan as person to contact
fix quotes
use mailto
add Leah as a code of conduct contact person
tweak contact emails
close proposal submission
List UofC CS department as a sponsor