Rename EventType protocol and update dependencies

ClojureScript 0.0-2311 changed the event/EventType protocol to event/IEventType. Also, Clojure 1.6.0 is required for this version of ClojureScript (see https://groups.google.com/d/msg/clojurescript/MEFJ5D7g8yM/cbiJJTyrKjsJ).
Merge pull request #21 from noklesta/fix-eventtype

Rename EventType protocol and update dependencies