Fix for view logic (sic!) and some refactoring.
Now checking that bidder isn't owner of auction
Overbid function available in view.
Auction owner doesn't see bid buttons in view
Duration for auctions can be set.
Time remaining displayed and considered in logic.

Also updated seeds.
Bidding bugfix and view enhancement.

Bug caused auction to receive wrong price when 2 bids had identical
max_bid.
Important fix of previous commit!
Refactoring and auction view enhancing.
Min price for auctions must be >0 now.
Merge branch 'feature/advanced_bidding_system' into dev
Merge branch 'dev' into feature/search

Conflicts:
	app/models/auction.rb
Resolved merge conflicts.