Greater Boston FinTech startups got off to a good start in 2016 on the funding front. Twelve firms raised more than $153 million in the first six months of the year, led by Circle, which raised $60 million. This is significantly more than Greater Boston FinTechs raised in the second half of 2015, and roughly equal to the $157 million raised by 15 firms in the first half of 2015 (which was also led by a big round for Circle). …