Merge pull request #1 from andysellick/feature/minor-tweaks

Feature/minor tweaks
Correcting some errors and adding header and footer to styleguide
Adding mixin for vertical gradient with a background image
Tweak to tabs js to allow tabs within tabs to function correctly
Merge pull request #2 from andysellick/feature/minor-tweaks

Feature/minor tweaks
Adding suggested js conventions to js section of styleguide
Merge pull request #3 from andysellick/feature/minor-tweaks

Adding suggested js conventions to js section of styleguide
Merge pull request #7 from andysellick/master

Minor tweaks