Update ring to 1.2.0

I was getting an error that looked like: https://github.com/weavejester/ns-tracker/issues/8

ns-tracker is a dependency of ring, and the fixed version is used by ring 1.2.0, which I am using, but due to a problem similar to: http://stackoverflow.com/questions/17209621/cant-load-hiccup

Compojure, which was using ring 1.1.7 as a dependency, pulled in the broken ns-tracker.

I decided to fork Compojure, update https://github.com/luke0x/compojure/commit/078f98ef7c7b763fad0b6be428af308af96f1669 ring, ran tests, and all looked fine.