Some additions and revisions

New language added: R
New alternatives for existing languages added: ColdBox (ColdFusion), Go, Backbone.js
Revised 1 Scala alternative
Clarified the difference between alternatives where they exist (and are not obvious from the repo name)
Syntactic and semantic fixes (e.g., those Clojure subheadings were broken)
I don't think we have to point out the testing framework here.