* Fix browser build to incorporate Markdown-It, not Marked
* Update Google Closure Compiler; recompile browser build but with MINIFY=false, because Closure Compiler throws an error on our current code; see https://github.com/google/closure-compiler-js/issues/59
* Bump version to 2.0.0-beta1; do release build, with updated docs and annotated source
* Update classes docs for CS2
* Port breaking changes from https://github.com/jashkenas/coffeescript/wiki/%5BWIP%5D-Breaking-changes-in-CoffeeScript-2 into new docs section
* Update browser compiler
* Update re @connec’s notes; split classes section into two sections for classes and working with prototypes; make breaking changes examples editable whenever possible