Merge pull request #26 from jdjkelly/master

Updated ARCHITECTURE.md to reflect changes to HTMLBars AST example, and ...
Sync simple-html-tokenizer

Sync simple-html-tokenizer to commit tildeio/simple-html-tokenizer@fa0717334a389e43342ee40ecd25d560003f1962.
Add support for web components

This commit introduces a new hydration hook that allows HTMLBars to integrate
with web components. The hooks has the signature

   WEB_COMPONENT(placeholder, tagName, context, options, helpers)

and is generated along with a placeholder whenever the compiler encounters an
HTML element with a hyphenated tag.

Compiler changes:

- a new ComponentNode which is a mix of ElementNode and BlockNode. It has the
  signature `ComponentNode(tag, attributes, program)`.

- a new hydration opcode `component` similar to the `helper` opcode.
Merge pull request #23 from mmun/hyphenated-tags

Add support for web components
Fix text-only attributes in components and empty components
Merge pull request #27 from mmun/fix-components

Fix text-only attributes in components and empty components
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