As Boston struggles to recover from yesterday's horrific bombings at the marathon, travel companies are making it easier for tourists to cancel or change their trips. Hilton, Starwood, IHG and other hotels groups have waived change fees. And most airlines flying in and out of Boston Logan International Airport are allowing travelers to change their itineraries without penalties through April 17. Although some hotels, including the Mandarin Oriental Boston and the Charlesmark Hotel, remain closed, others like The Lenox Hotel reopened this morning for evacuated guests to collect their belongings. Much of the area remains off-limits, but the Lenox will be operating at full capacity this evening, according to their website.