Show amount of bills sponsored by legislators.

When listing legislators show how many bills they sponsored.
Preparing for the Bcryptening!

Added Bcrypt Gem and had the Users table updated to have password_digest
column
Adding pagination to site.

Do you hate long lists? Love sifting through pages!? Well now we have
pagination! Special Thanks to Ashton Thomas for pointing me to
will_paginate and providing me with an example. Moved the contents of
bill/index and legislator/index view into partials since they're reused
in other parts of the application.