When Keystone Town Manager John Crone hired Andrew Nelson as the town’s new community development director in May, he knew Nelson had faced numerous accusations while working in town governments across Colorado. Nelson has been the subject of two criminal convictions since 2005 — one for a DUI and another for weapons-related charges. He was also named in two civil lawsuits related to his professional work in 2020. Crone, who has worked for Keyst…