1.0.0

• Changed: upgraded to postcss v4.x
• Changed: import is not considered as a feature anymore, but is now directly an option for the API.
  It is still enabled by default.
  Before

cssnext({
  features: {
    import: {
      root: "./src"
    }
  }
})

After

cssnext({
  import: {
    root: "./src"
  }
})

• Added: url option: non absolute url() are now rebased according to from (and to options if provided). Enabled by default.
• Added: compress option now accept CSSWring options directly.
• Added: browsers option can enable or disable features and is propagated to autoprefixer
• Added: px fallback for rem unit