Re-integrate Foundation in Composer

I don't want to use Bower to only install foundation. Composer works great for that too.
Merge pull request #28 from j0k3r/composer-zurb

Re-integrate Foundation in Composer
Add rimraf and remove del

Rimraf allow to remove a non-empty folder.
Merge pull request #29 from j0k3r/rimraf

Add rimraf and remove del
Update deps
Add images to Twitter Extractor

Instead of using the oembed solution, we now use the Twitter API so we
can retrieve images from it save it to the content
Handle bigger Tumblr ID
Merge pull request #31 from j0k3r/improve-twitter

Add images to Twitter Extractor
Update deps
Optimize composer build
Update deps
Add README