(feature) Add support for Twitter cards
(feature) Add support for Twitter cards

Add meta data to head for to support Twitter cards
https://dev.twitter.com/docs/cards

bcmoseley/made-mistakes-jekyll,wakermahmud/made-mistakes-jekyll,mmistakes/made-mistakes-jekyll,zhelezko/made-mistakes-jekyll,zhelezko/made-mistakes-jekyll,bcmoseley/made-mistakes-jekyll,blogtips/blogtips.github.io,wakermahmud/made-mistakes-jekyll,bcmoseley/made-mistakes-jekyll,mmistakes/made-mistakes-jekyll,blogtips/blogtips.github.io,wakermahmud/made-mistakes-jekyll,blogtips/blogtips.github.io,zhelezko/made-mistakes-jekyll,mmistakes/made-mistakes-jekyll