One day after nuTonomy got the green light to test its self-driving cars across Boston, Gov. Charlie Baker has signed a memorandum that paves the way for testing in 14 other communities across the Bay State. The memorandum of understanding, which Baker signed on Thursday, establishes a pathway for companies to apply to test their autonomous vehicles in the following cities and towns: Arlington, Braintree, Brookline, Cambridge, Chelsea, Malden, Medford, Melrose, Newton, Revere, Somerville, Weymouth,...