HOUSTON--(BUSINESS WIRE)--Small business owners began 2015 with the strongest optimism since January 2014 as evidenced by plans to hire more workers, increase compensation and boost sales, according to the most recent Business Confidence Survey released today by Insperity, Inc. (NYSE: NSP), a leading provider of human resources and business performance solutions for America’s best businesses. Responses indicated that 50 percent of business owners are adding employees compared to 31 percent in O