Merge pull request #2 from anushbmx/master

Added og image for sharing
Content update.
Merge branch 'master' of github.com:riverspirit/html5conf.in
Merge pull request #3 from anushbmx/master

Removed sponsor category
Updating a partner logo
Several changes including fb share image, content updates etc
More content updates.
Changing the event hashtag to #html5defcon due to conflict
 Resized the bg image from 1MB to 137KB