It's time. After 150+ episodes on great companies, we tackle the granddaddy of them all — Berkshire Hathaway. One episode alone isn't nearly enough to do Warren and Poor Charlie justice, so today we present Part I: Warren's story. How did a folksy, middle-class kid from Omaha become the single greatest capitalist of all-time? Why, like Jordan, did he retire (twice!) at the top of his game, only…