Mayor Marty Walsh has launched the first city-wide planning effort since 1965. As anyone involved with the politics of development knows, these days projects pretty much get considered one-by-one. The effort will ramp up over the next few years, leading to a blueprint for what the city should be like in 2030. The city has a fancy new Web site devoted to the effort. If you Tweet, the city wants folks to use #ImagineBos.