TORONTO - A Wall Street buyout firm and a sports advisory company reportedly made a joint proposal to buy all 30 NHL teams for as much as $3.5 billion. Bain Capital Partners LLC and Game Plan International, both based in Boston, made the offer in a 30-minute presentation to NHL owners on Tuesday in New York, sources told the Toronto Star and The Globe and Mail. The companies were invited to make their pitch by NHL commissioner Gary Bettman. Bain managing partner Steven Pagliuca, co-owner of the NBA’s Boston Celtics, and Game Plan, which recently acted as an adviser on...