v3.8.0

Cleanup and upgrades to packages.

• .scss-style.yml updated shorthand property rule to use 4
• Changed autoprefixer-core to autoprefixer since projects merged
• Plugins updated:
  • grunt-scss-lint from 0.3.8 to 0.5.0
  • [Security] Bump grunt-gh-pages from 0.9.1 to 3.1.0
  • grunt-contrib-compress from 0.13.0 to 1.4.3
  • grunt-postcss from 0.5.5 to 0.9.0
  • grunt from 0.4.5 to 1.0.3
  • grunt-contrib-watch from 0.6.1 to 1.1.0