Come 7 a.m., D.C.-area coffee counters turn into mini-war zones. Every morning, baristas are assaulted with wave after wave of java-heads, looking for their morning fix, and only the most grizzled, hardened and well-trained survive. This weekend, the Mid Atlantic Regional Barista Competition comes to D.C. to weed out the weaklings and find the best local barista. This year’s competition, hosted by Murky Coffee, takes place in the Washington Convention Center from February 15-16 alongside…