Add home_id to bills
Add home selection to bills
Bills are scoped on the main view by the current user

They are additionally ordered by the home they belong to
Add some links to the toolkit

"Add a Bill"
"Manage Households"
Modify the Clearance built-in views for Bootstrap
Add BillSplits

This allows the home admin the ability to split a bill by percent.

The form will automatically update the roommate list whenever a
different home is selected from the home drop-down.
Fix bill_splits to use Float vs. Int percents

There's also some style changes here to make the bills look nicer in their various incarnations.

Additionally added a sign_in for bills_controller_test because that's now behind user authorization.
Move from TestUnit to RSpec w/ FactoryGirl
Add BillSplit calculations and submit RoommateID

bills.js.coffee includes a bill split calculator that automatically calculates the split for a bill between roommates on the bill form.