That’s the conclusion of former DCist editor and urban planner Rob Goodspeed, who has crunched the most recent numbers on his blog. Goodspeed predicts that Washington’s long history as a majority-black city will come to an end as soon as 2014, at which time the city’s black population will make up just above 49 percent of residents, with whites, Asians and other ethnic groups making up the rest of the population. The projection puts the…