Solved error: `error scss/bourbon/css3/_background.scss(Line 18: \
$string: #dfdfd1 is not a string for `str-slice')`.
This error happened when passing only a color to background mixin.
Like this: `@include background(#dfdfd1)`.
Replace en-dash with regular dash
Fixes #517
Merge pull request #516 from cganterh/master

Solved error in _background.scss
Fix for background.scss in app/stylesheets that PR#516 added to dist/
Add CSS3 text-decoration mixin

* Closes #509
Add CSS3 selection mixin

Selection mixin explained/requested in issue #542.
Add @import to main bourbon partial for selection mixin
Add @import to /dist bourbon partial for selection mixin
Simplify selection mixin
Merge pull request #544 from Bionicrm/master

Add CSS3 selection mixin
Refine README, LICENSE and CONTRIBUTING docs