Update index.html

ie fix for html5 tags
Merge pull request #1 from ploebus/master

Bring in IE fix for html5 tags
Update index.html

eventbrite, sponsor link
new logo
Update index.html
Merge pull request #2 from adstiles/patch-1

Grammar fixes; smoothing things out a bit.
Adding code across america logo to organizers
Merge pull request #3 from openoakland/code-across

Adding code across america logo to organizers
Resolve some merge conflicts bringing master into gh-pages, add inline padding so the logos don't bump into each other