A Boston-area start-up called Bitsight is pulling in investor money so quickly, a total of $95 million, that it doesn't know what to do with it all … yet. And what does Bitsight do, to justify this level of investment? It examines company websites, evaluates them for the quality of their website security, and assigns them a rating, much like a credit score. How do they do it? There's a bit of proprietary secret sauce in how the company evaluates the security of a website, but what's particularly...