The story of St. John Brewers is the kind of thing you talk about doing one day as you sit on the beach with a cold beer in your hand.  It’s the fantasy of leaving the big city job in the States and starting a brewery in the islands.  For Chirag Vyas and Kevin Chipman, friends and former roommates at the University of Vermont, it was reality, and we’re jealous as hell. Chirag, a scientist at NASA, and Kevin, a physical therapist at a Boston medical center, learned just a few years out of college that the daily 9 to 5 grind was not for them.  They moved to islands,…