Minor fixes

Better targetting for button-like links and navigation links,
buttons.css and nav.css
Fixed tabs hover when there was no active tab, tabs.css
Fixed select color when disabled, forms.css
Deleted silly code from pagination.css, menus.css
Dropped default bg-images in favor CSS3 gradients.

Dropped background images in favor of CSS3 gradients. Can be reversed
setting "$fullCSS3: false" in _config.scss
Updated normalize.css
Updated FontAwesome
Removed FontAwesome hacky-path from sass/icons/_fix.scss
Added unstyled buttons to sass/ui/_buttons-helpers.scss
Removed breadcrumb separator from sass/nav/_breadcrumbs.scss
Improved selector for button links in sass/ui/_buttons.scss
Bugfixes minor additions

Removed margin from buttons, _buttons.scss
Added disabled class to buttons
Added button modifiers ("styles") (size, font size) to _buttons.scss
Fixes #7, Fixes #8, Fixes #9, Fixes #10, Fixes #11
Separations of colors and vars, added fontstacks variables