Usage:
var HTML5 = require('html5');
Major kinds of object:
HTML5.Parser
Parses tokens into a DOM tree
HTML5.Tokenizer
Parses textual input into a stream of tokens
HTML5.TreeWalker
Walks a DOM tree and emits a stream of tokens
Major functions:
HTML5.serialize(sourcetree, target)
Will use a TreeWalker to walk a tree, taking the stream of tokens and emitting 'data' events to target, passing a string each time.