Revert "Revert version update"

This reverts commit 143024b6efa583d48707945a439e11a4a488adf1.
Revert "Revert "Update to Clojure 1.6.0 (now the minimum version) and CLJS 0.0-2261""

This reverts commit 74839cc033d9429b6ac87259d4f1cd84c75e997e.
Bump pom.xml version