Add compatibility for inline JS/CSS groups

It'd be nice to be able to render groups of inline JS/CSS much like you can with the standard groups.

The reason for this is for example outputting non jQuery related global vars in the header i.e.

``` javascript
var basePath = '/path/to/scripts';
```

And then also the ability to add some bits after the group in which jQuery is rendered.

``` php
\Casset::render_js_inline('without_jquery');
\Casset::render_js('footer'); // includes jquery and other JS which relies on JS from without jQuery inline group like paths for ajax requests etc
\Casset::render_js_inline('with_jquery'); // includes inline js included from within controllers etc which relies on jquery.

```

It'd also be nice given the above if dependency support for inline groups might be included too.

Cheers

Ben

Start from the Casset::render_js_inline and Casset::render_js entry points, then compare how standard groups are registered and rendered. Define how named inline groups are ordered around standard groups and how their dependencies behave; done means the examples can render pre-jQuery and post-jQuery inline content for both JS and CSS.

Written by the indexing model from the issue text.