MADAWASKA, Maine — Since early childhood, Griffin Lavertu of Portland has been traveling to visit his grandfather James in Madawaska. But this summer he decided to take the trip on a bicycle. The idea sparked when Lavertu was skiing with some friends over the winter, and they said the trip across the state would probably be manageable. So, he and his friend Malcolm O’Wril left on Monday, June 22, and arrived in Madawaska at 10:30 p.m. on Thursda…