Clean up and bug fixes

Scss lint used and corrected many small bugs
Variable names updated to keep consistency
Variable colours updated to lowercase and short names
All strings updated to single quotes
Added better and more consistent comments
Removed extra files (contact)
Renamed nag file to header
Removed media queries for HD screens
Updated xl media query to live in the vars file
Indentation corrected

Please check for error as many things have been changed

Mixins revamped

All mixing have been rewritten to allow better management of browser prefixes (Thanks to @hugogiraudel). Mixin transition-dur has been removed, box-shadow now uses one value.

Added .centre and bug fixes

A couple of bug fixes with .pre* classes and added a new class .center for centred spans.
Added sache file to add the repository to sache.in
Minor bug fixes

Added viewport metatags

Forgotten viewport metatag on previous releases.

XL Layout improved

Fixed a couple of bugs with the x-arge layout

Optimised grids

Small tweaks to the grid system to avoid repetition, bug fixes

Stable version 0.9.3

Bugs sorted, tested stable