Only allow one invoice when creating auction and add validations.
Move bid and debtor view modals into partials.
Only display auctions if they have been previewed/confirmed.
User sees invoice popup modal.
Display invoice modal/popup in auction and preview show pages.
Seller can delete an invoice if it is not in use.
Seller edits debtors information.
Seller destroys debtors and invoices belonging to it.
Seller can edit/update company info in their account settings page.
Seller deletes auction.
Make spec clearer.
Display correct percentages in auction.
Seller can set buyout parameters for auction to close instantly.
Create an Administrator type account for admins.

* Give admins Administrator accounts rather than storing them in an ENV.
* Keeps things more in line with Seller and Buyer types.
Create Administrator accounts when creating admins using Rake task.
Add basic styling to homepage.