add rights for bids (view+controller) : only one bid per auction and per user + correction DateTime (WARNING : BUG, see trello)
Correction of mistake on last commit
extend end_date if needed + enhance code lisibility
erase debug code on view
comment option that allows user to pick the end_date, the end_date is auto set to now + 30 minutes
the description of the auction can not be edited if a bid as been placed
fixed bug on bidding, the min bidding value = current_value+INCREMENT_STEP
Merge branch 'master' into win

Conflicts:
	app/controllers/auctions_controller.rb
	app/models/auction.rb
	app/views/auctions/index.html.haml
Merge pull request #9 from New-York-Falcons/win

Win