Adding open CFP as well.
Merge pull request #12 from trygve-lie/gh-pages

Adding WebRebels
JSConf US is sold out!
Aus is on sale and with a call for speakers
EmpireJS on-sale and CFP open.
Merge pull request #14 from EmpireJS/gh-pages

EmpireJS on-sale and CFP open.
Web Rebels - Linking to main site and added revamped logo