Fixed issue #23

Squashed commit of the following:

commit 11f3e8327dd698f0395babc0eca74842ca5f88b4
Author: Daryl Hedley <darylhedley@hotmail.com>
Date:   Mon Dec 16 09:13:09 2013 +0000

    Changed less file naming to reflect content

commit faff92c351dad1199b24c3366f1f75e1888165d4
Author: Daryl Hedley <darylhedley@hotmail.com>
Date:   Mon Dec 16 09:11:30 2013 +0000

    Fixed bug with navigation z-index

    - Added z-index:999 into core styles