Support at least one more level of content nesting in the site/theme.

[ajpiano]

We need to support nested content so we can have jQuery UI and Mobile content, at a bare minimum, and having another layer of organisation will generally be helpful. This issue is here to track the progress on this in jquery/grunt-jquery-content#25 to add support for this in order.yml, and jquery/jquery-wp-content#128 to add support in the theme

[ajpiano]

The first part of this is complete - parsing the order.yml. jquery/grunt-jquery-content#25
It will be available in grunt-jquery-content 0.5.16 when it's tagged. Now we just need to do the template side of things

[ajpiano]

Long since finished!