message: remove unused postcss
diff: -/**
  - * Created by tsxuehu on 17/1/4.
  - */
  var config = {
  -
  - "bem": {
  - "shortcuts": {"component": "b", "modifier": "m", "descendent": "e"},
  - "separators": {"descendent": "__", "modifier": "--"}
  - }/*,
  - "autoprefixer": {"browsers": ["ie > 8", "last 2 versions"]},
  - "rem": {"browsers": ["ie > 8", "last 2 versions"]}*/
  + 'bem': {
  + 'shortcuts': {'component': 'b', 'modifier': 'm', 'descendent': 'e'},
  + 'separators': {'descendent': '__', 'modifier': '--'}
  + }
  };
  // https://github.com/trysound/postcss-easy-import
  var partialImport = require("postcss-easy-import")();
  