Removed destroy function for auctions, edit only shown when owner.
Owner can edit auction, but not chance price!
Migration file fix otherwise db doesn't run on OSX

Also added db/schema.rb to gitignore file (again).
Readded destroy functionality for auctions

As per requirements, but only for auctions with no bids yet. Sorry for
the confusing TODO remarks :)
Edge case for first bid handled.
Can only submit valid bids from view (#7)
Bid model validation complete (#7).
Merge branch 'origin/fix/cleaning_up_1'