改造postcss-px-to-viewport

增加include配置项

配置文件.postcssrc.js（修改第三方库被影响的情况）

##### 增加exclude配置项
配置文件.postcssrc.js（修改第三方库被影响的情况）

"postcss-px-to-viewport": { viewportWidth: 750, viewportHeight: 1334, unitPrecision: 3, viewportUnit: 'vw', selectorBlackList: ['.ignore', '.hairlines'], minPixelValue: 1, mediaQuery: false, include:/(/|\)(mobile)(/|\)/ exclude: /(/|\)(node_modules)(/|\)/ },

### Example

```js
'use strict';

var fs = require('fs');
var postcss = require('postcss');
var pxToViewport = require('..');
var css = fs.readFileSync('main.css', 'utf8');
var options = {
    replace: false
};
var processedCss = postcss(pxToViewport(options)).process(css).css;

fs.writeFile('main-viewport.css', processedCss, function (err) {
  if (err) {
    throw err;
  }
  console.log('File with viewport units written.');
});

Options

Default:

{
  viewportWidth: 320,
  viewportHeight: 568,
  unitPrecision: 5,
  viewportUnit: 'vw',
  selectorBlackList: [],
  minPixelValue: 1,
  mediaQuery: false
}

• viewportWidth (Number) The width of the viewport.
• viewportHeight (Number) The height of the viewport.
• unitPrecision (Number) The decimal numbers to allow the REM units to grow to.
• viewportUnit (String) Expected units.
• selectorBlackList (Array) The selectors to ignore and leave as px.
  • If value is string, it checks to see if selector contains the string.
    • ['body'] will match .body-class
  • If value is regexp, it checks to see if the selector matches the regexp.
    • [/^body$/] will match body but not .body
• minPixelValue (Number) Set the minimum pixel value to replace.
• mediaQuery (Boolean) Allow px to be converted in media queries.

Use with gulp-postcss

var gulp = require('gulp');
var postcss = require('gulp-postcss');
var pxtoviewport = require('postcss-px-to-viewport-ygg');

gulp.task('css', function () {

    var processors = [
        pxtoviewport({
            viewportWidth: 320,
            viewportUnit: 'vmin'
        })
    ];

    return gulp.src(['build/css/**/*.css'])
        .pipe(postcss(processors))
        .pipe(gulp.dest('build/css'));
});