Revert "prepared site for next year by removing sponsors, sign-up and sign-in"

This reverts commit f495f6e7d0a60319e0f5468447f3634535b7c51f.
Added info about this year's event
let's hope this fixes the merge
Removed sponsors which aren't sponsoring 2015 - yet
Updated info for this year's conference
Removed link to program since we don't have one yet
Opened sign up