Added CognitiveClouds logo and write up. Fixed #75
TODO: Add a blog post.
Added blogpost for CognitiveClouds. Please review the post once for me.
Added Flipkart logo to home page and sponsors page.
Updated text on CognitiveClouds blog post as per
@char-star 's suggestion
Fix Cognitive Clouds sponsor blogpost
Updated Flipkart logos, took then from official Press Kit at http://www.flipkart.com/about-us
Add promotional badges

* Both retina-optimized and normal versions at 220px and 120px sizes.
Adding blog post for flipkart
Changed Flipkart's blurb according to latest given to us by them.
Logos are now vertical aligned.
Remove the + become_sponsor image and add a link
Aligned the "Become a Sponsor" button
Make sure retina versions are used for sponsors