Set up iFrame for Roll It Case Study

Need to make our own view of this (e.g. like a Medium style layout).
Here's the source to make that easier:
https://github.com/html5rocks/www.html5rocks.com/commits/master
Updated twitter call to sign requests per 1.1 spec
Created Vagrantfile.example for vagrant 1.1 compatibility
Readding vagrant files to repo and updated database.yml
Updated database.yml template
Added RT to regex
Merge branch 'refs/heads/dev'
Revert "Set up iFrame for Roll It Case Study"

This reverts commit 4ac1f9d3af21dfd2e5c3b4149272bebef9df88ea.