Add documentation to Graphics tiny API.

Signed-off-by: Grant Skinner <info@gskinner.com>
Fix for examples.css to avoid resizing canvases.

Signed-off-by: Grant Skinner <info@gskinner.com>
Update all demos with new examples.js.

Also: editable ids, and formatting cleanup.
Signed-off-by: Grant Skinner <info@gskinner.com>