add more Clojure extensions and/or dialects'

- .cljscm https://github.com/myguidingstar/clojure-scheme
- .cl2, .hic https://github.com/chlorinejs/chlorine/wiki
- .cljx https://github.com/lynaghk/cljx
- .cljc https://github.com/schani/clojurec