Change comments to match_index-fluid.html

https://d396qusza40orc.cloudfront.net/startup%2Fcode%2Findex-fluid.html
Add row-fluid classes and adds alt attributes to all image properties.

Matched with https://d396qusza40orc.cloudfront.net/startup%2Fcode%2Findex-fluid.html
Add social buttons
Add Google analitics
Add preorder with bitconis button
Updated text and shape of preorder button