Enqueue styles above scripts when Spine theme is used

By default, Custom CSS output the CSS link on wp_head, which meant
that the one style would be provided to the browser after a bunch
of enqueued scripts. This could cause delays in styling the DOM.

The new way is also more sane. :)
Merge pull request #9 from washingtonstateuniversity/spine-style-order

[Pr] Enqueue styles above scripts when Spine theme is used