On the heels of Time Warner Cable's streaming test for its internet customers, Comcast's Stream TV is live in the Boston area. That's if you're paying for Xfinity internet service, of course. Announced back in July, the service gives cord cutters who still use Comcast for web access the ability to stream all of the live television from major networks, HBO and a library of on-demand options for $15 a month. Sorry sports fans, it doesn't include ESPN, and you can only watch live broadcasts from the comforts of home. However, the on-demand movies and TV shows can be streamed while you're on the go.