[chicago 2014] add Chef as Gold Sponsor
Add Cisco as a wireless sponsor. Waiting for Backstop logo
[chicago 2014] add logos for Enova
[chicago 2014] update Enova logo
Add Backstop as a wifi sponsor
[chicago 2014] Add Enova as a Silver Sponsor
[chicago 2014] CHEF, not Chef
Merge pull request #1219 from DevOpsDaysChicago/master

[chicago 2014] add sponsor logos