修复：webpack打包修复 (#21)

* 修复打包逻辑问题

build/webpack.build.js

@@ -1,6 +1,6 @@
 var webpack = require('webpack');
 var getPostcssPlugin = require('./utils/postcss_pipe');
-var config = require('./webpack.config.js');
+var config = require('./webpack.config.dev.js');
 
 config.entry = {
   'vant': './src/index.js'

build/webpack.build.min.js

@@ -1,7 +1,9 @@
 var webpack = require('webpack');
-var config = require('./webpack.config.js');
+var config = require('./webpack.build.js');
 
-config.output.filename = config.output.filename.replace(/\.js$/, '.min.js');
+config.entry = {
+  'index': './src/index.js'
+};
 
 config.plugins = config.plugins.concat([
   new webpack.optimize.UglifyJsPlugin({