ARAPAHOE BASIN — The 131-day wait is over. That’s how long it has been since Arapahoe Basin became the final Colorado resort to close last season — on June 12 — and Friday when the Loveland Pass mountain officially launched the start of skiing and snowboarding in North America. “I’m just, like, so stoked,” said Julie Brown, of Silverthorne, as she stood in a cow costume with dozens of others waiting for A-Basin’s only-open lift to start turning.