Clojurians Log v2

Comments desired: https://github.com/walmartlabs/lacinia/pull/323

Previously, Lacinia caught exceptions and converted them to errors, which was harmful. This change should make it easier to track down exceptions inside resolvers.

Ideally, you're using something like https://github.com/AvisoNovate/pretty which can unpack the exception and report the ex-data for it.