Officially drop IE9-10 support, pull out our hacks (#2296)

- I also fixed a bunch of related comments
- I had to polyfill `requestAnimationFrame` for Node
- Drive-by: run `eslint . --fix`
- Drive-by: update transpiling info in CONTRIBUTING.md
- Drive-by: we aren't the only ones going semicolon-free

module/module.js

@@ -16,6 +16,8 @@ window.module = {
 	set exports(value) {require.$$modules[require.$$current()] = value},
 }
 
+window.global = window
+
 function require(name) {
 	var relative = require.$$current()
 	var slashIndex = relative.lastIndexOf("/")