Five things you need to know today, and introducing the 'Mass 100'

Good morning, Boston. You made it to Friday. Here are the five things you need to know in local business news to start your day, and a new stock index that tracks Massachusetts companies.WinnCompanies and the Boston Housing Authority have closed on $70 million in financing for the first building in the redevelopment of the Mary Ellen McCormack property, reports Greg Ryan.The Massachusetts Opportunity Alliance, formed last year by a constellation of influential trade organizations, on Thursday&he