* Docs: named functions and function declarations
* No more prototypal `extends`; update docs and example
* More comprehensive documentation of the existential operator; closes#1631
* Better document operators, including `from`
* No fat arrow class methods anymore
* Destructuring shouldn’t say that default values are applied in case of undefined or null
* Spinoff generator and async functions into their own sections; reorder things so that the sections on functions come just before classes, and destructuring goes next to the operators (which discuss assignment)
* Rewrite “CoffeeScript 2” section, making it less practical and more explanatory; move practical info into “Usage”
* Update “Variable Scoping and Lexical Safety” section to remove incorrect reference to Ruby (fixes#2360), add missing details about the safety wrapper, add note about `let`/`const`.
* Updated browser compiler
* Updated docs
* Rewrite Literate CoffeeScript breaking changes
* Split apart the “Breaking Changes” and “Unsupported Features” sections into separate sidebar items and files
* Add example of `not in`, closes#3281
* Fix words in bold that should be in backticks
* Consolidate some breaking changes sections
* Add Node API documentation; closes#3551
* Move the chaining documentation out of the changelog into its own section
* 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
