Turn on the non_camel_case_types warning by default

[brson]

I'm in favor of being opinionated about syntax.

[Dretch]

+1

[brson]

I've turned this on, but need to go back and make sure it gets the spans right. I think it's pretty sloppy atm.

[graydon]

File "wrong spans" as a followup bug. Closing.