fix(relative-paths): fix to allow url rebasing to use relative paths
fix(relative-paths): fix to allow url rebasing to use relative paths

- this.separateCSS was undefined due to function scope
- setting 'root' option takes precedence over 'target' so clean-css always used absolute paths

matthewbauer/plugin-raw,systemjs/plugin-css,systemjs/plugin-css,pieter-lazzaro/plugin-css,pieter-lazzaro/plugin-css,matthewbauer/plugin-raw,gig177/plugin-css,gig177/plugin-css