In its three years of operation, Blueprint Coffee has become one of St. Louis' most respected coffee shops — and the headquarters for a brand selling coffee across the nation.But Hain BluePrint, the New York-based company that markets BluePrint organic juices along with a host of other "natural" products, wants to halt that expansion. The company has filed suit in federal court against Blueprint Coffee, alleging that there is "a likelihood of confusion" between the two brands.…