Fixed some errors in articles#sync. Show better error messages.
Fixed loosing assignments when updating a task.
Fixed wrong articles total in group_order#show.
Update group results when editing order article in balancing.
Fixed modal forms. Submit form when hitting enter.
Allow article price equal to zero. Closes #111
Added quiet_assets gem to have cleaner log file in developing.
Fixed setting all user setting to false in user profile.
Merge remote-tracking branch 'bennibu/rails3' into rails3

Conflicts:
	app/controllers/articles_controller.rb
	app/views/articles/_form.html.haml
	app/views/articles/sync.html.haml
	app/views/finance/balancing/_edit_note.html.haml
	app/views/finance/group_order_articles/_form.html.haml
	app/views/finance/order_articles/_edit.html.haml
	app/views/finance/order_articles/_new.html.haml
	app/views/group_orders/show.html.haml
	app/views/invites/_modal_form.html.haml