Fix sponsor logos

- make nilenso background medium
- add github back to associate sponsors
[sd] adding kitallis/steven speaker photos.
Merge branch 'master' of https://github.com/kaiwren/conference
Merge pull request #72 from gautamrege/master

Added Aaron and Andy profiles; enabled the schedule
Fix schedule and doattend links

- uncomment schedule everywhere
- comment doattend everywhere
[sd] changing to opaque background nilenso logo to satisfy saagers requirements.
[sd] merged.
Merge logo and speaker imange changes from Nilenso

- remove rubylearning duplicate
- rebalance logos
[sd] fixing FF onload=>load=>onload flicker bug.
Merge branch 'master' of https://github.com/kaiwren/conference
Merge pull request #73 from nilenso/master

Fixing FF js flash bug.
Added Keynote talks
Merge branch 'master' of github.com:kaiwren/conference
Opened the "Buy Tickets" but changed text to "closed"