Feature enhancements for Foi-Toy web tool

[getify]

Just launched the online Foi-Toy web tool. It's super rough and ugly. Here's a variety of ideas I have to improve it. There's more that's not on the list, too.

1. make it look cool/professional, like the Peg.js online tool looks.

2. add a "code editor" widget (e.g., Ace, CodeMirror, etc) to the page for the entry of the code, instead of just a textarea

3. add github oauth to "login" so you can save snippets to your own gists and reload them and share (via shortlink) with others

4. pre-written "snippets" selector which shows a JS snippet side-by-side with a Foi snippet, so that you can select and auto-populate the tool with it (and perform the tokenization/syntax highlighting)

5. "screenshot" feature for the syntax highlighted code (export to SVG or PNG)

6. add feature where code in editor, syntax highlighter, and tokens list are scrolled/highlighted in "sync".

7. individual font-size selectors for code input box, syntax highlighting, and token list

8. make code input box, syntax highlighting iframe, and token list user-resizable (at least vertically)

9. offer some config options, like whether to validate or not, and save config settings in local storage

10. etc