Running back Tyler Purdy is joining Jacob Dobbs in following former Holy Cross Head Coach Bob Chesney to James Madison.  Purdy made the announcement last night on his social media pages. He joins Dobbs who committed to JMU two weeks ago. Many have speculated that former Crusaders quarterback Matthew Sluka could also join Chesney and his former teammates but Sluka has yet to make a decision. Purdy is a 5-11…