Lennar\u2019s purchase of rival CalAtlantic Group creates the largest homebuilder in the U.S.\xa0 Taylor Muckerman and Jason Moser analyze the deal and the future for homebuilding stocks.\xa0 Macy\u2019s hits an 8-year low. Ellie Mae reports earnings.\xa0 And Constellation Brands buys a 10% stake in Canopy Growth Corp., a publicly-traded cannabis company with an all-time great ticker symbol.