OS landing page: added logos new projects

SeLion and Accessible Video player and logos added to the page
index.html update

changed css class. new logo wasn’t showing up
fix class on second row of modules

fix error module not showing up
fix typo class name

trying to get changes pushed merge conflict
Merge branch 'master' of https://github.com/paypal/paypal.github.com

Conflicts:
	index.html
added missing close li

bugs
merge sync

match other update
Merge pull request #6 from cathydesign/master

OS landing page: added logos new projects