"Bloomberg Risk Takers" profiles David Neeleman, co-founder of JetBlue Airways Corp. and Morris Air, who is charting new territory with his latest enterprise, Azul Linhas Aereas Brasileiras, a domestic carrier in Brazil.   Neeleman discusses his career in the airline industry, his struggle with attention-deficit hyperactivity disorder and his new company, Azul. The show includes interviews with his brother, former employers and analysts.