Inline SVG with Cacheable External File Mixin

gistfile1.scss

// Example using multiple colors with SVG Sprites .. see it in an example with:
// $ git clone -b svg-inline-experiments --single-branch https://github.com/unicorn-ui/Buttons.git Buttons && cd Buttons && npm install && pushd svg-builder && npm install && grunt && popd && grunt dev

@mixin svgColors($fillColor: false, $color: false, $patchCurrentColorForIE: false) {

  @if $fillColor {
    fill: $fillColor;
  }

  @if $color {
    color: $color;
  }

  @if $patchCurrentColorForIE {
    * [fill='currentColor'] {
      fill: currentColor;
    }
  }
}