The 61st annual Obie Awards, established by the Village Voice to acknowledge achievement in off-Broadway theater, named Rajiv Joseph’s gripping drama with humor Guards at the Taj as the best new play of the season. Guards was presented by the Atlantic Theatre Company and the award includes a $1,000 prize to the playwright. The Obies, which sets no predetermined limit on the number of awards it will give out in any given season, also Monday evening presented awards in…