BALTIMORE — Minutes after the Ravens' 28-24 loss to the Pittsburgh Steelers on Sunday, coach John Harbaugh said this was a new beginning. Hopefully that includes J.K. Dobbins and Gus Edwards as his top two running backs. When the Ravens selected Dobbins out of Ohio State in the second round of the NFL draft in April, it was a signal that the La Grange, Texas, native was their running back of …