Those Dragons continue to roar. The CBC venture capital series Dragon’s Den (featuring Robert Herjavec, right) drew 1,820,000 Wednesday night, with about half that in the valued 25-54-year-old range. Look at how these Dragons have roared after six episodes this season (all figures BBM Canada overnight estimates):Sept. 30 1,320,000Oct. 7 1,479,000Oct. 14 1,678,000Oct. 21 1,717,000Oct.