依赖更新 && 构建调整 (#60)

* upgrade dependencies

* 更改所有 saladcss 写法

* fix: 升级依赖导致的样式错误

* fix: build vant css

* use es module when pack && webpack scope hoisting

* fix: vue module version

* delete unused npm script

* fix: build:vant script not work

* fix: webpack config format

* fix: build minify vant.js

* fix: captain ui relative link

packages/vant-css/gulpfile.js

@@ -1,11 +1,10 @@
 var gulp = require('gulp');
 var postcss = require('gulp-postcss');
 var cssmin = require('gulp-cssmin');
-var postcssPlugin = require('../../build/utils/postcss_pipe')();
 
 gulp.task('compile', function() {
   return gulp.src('./src/*.css')
-    .pipe(postcss(postcssPlugin))
+    .pipe(postcss())
     .pipe(cssmin())
     .pipe(gulp.dest('./lib'));
 });