By Ashlee Vance and Brad Stone from Business WeekFlickinger, 37, a software engineer and IT consultant by trade, doesn’t leave the house much these days. He’s a full-time Bitcoin miner.Bitcoin is the digital currency that thrills nerds, inspires libertarians, and incites the passions of economists who debate the value of money made from nothing but ones and zeroes. Devotees watch the fluctuations of Bitcoin’s price with a fanaticism typically reserved...