Remove webpack shell plugin for webpack because it've been solved in another way

package.json

@@ -157,7 +157,6 @@
     "script-loader": "^0.7.0",
     "style-loader": "^0.13.1",
     "url-loader": "^0.5.7",
-    "webpack": "^1.13.2",
-    "webpack-shell-plugin": "^0.4.3"
+    "webpack": "^1.13.2"
   }
 }

webpackBaseConfig.js

@@ -3,13 +3,9 @@ var path = require('path');
 var ExtractTextPlugin = require("extract-text-webpack-plugin");
 var HtmlWebpackPlugin = require('html-webpack-plugin');
 var CopyWebpackPlugin = require('copy-webpack-plugin');
-var WebpackShellPlugin = require('webpack-shell-plugin');
 
 module.exports = {
     plugins: [
-        new WebpackShellPlugin({
-            onBuildStart: ['cd node_modules/codemirror && npm install && ./release.sh']
-        }),
         new webpack.ProvidePlugin({
             Visibility: "visibilityjs",
             Cookies: "js-cookie",