Add favicon icons

Adding the owl logo as the default favicon image.
We are using the reference to owl.png,
so, once the logo is updated we should have
updated also the favicons.

Change-Id: If8119f84dad2958649a4de47463381e7abfcd2af

webpack.common.js

@@ -1,6 +1,7 @@
 require('es6-promise').polyfill(); // https://github.com/webpack/css-loader/issues/144
 const HtmlWebpackPlugin = require('html-webpack-plugin');
 const I18nPlugin = require('./src/js/plugins/i18n');
+const FaviconsWebpackPlugin = require('favicons-webpack-plugin');
 
 module.exports = {
   entry: __dirname + '/src/js/index.js',
@@ -16,6 +17,15 @@ module.exports = {
     }),
     new I18nPlugin({
       localePath: 'i18n/locales'
+    }),
+    new FaviconsWebpackPlugin({
+      logo: __dirname + '/src/img/owl.png',
+      prefix: 'icons-tripleo/',
+      emitStats: false,
+      statsFilename: 'iconstats-tripleo.json',
+      persistentCache: true,
+      inject: true,
+      title: 'TripleO UI'
     })
   ],
   module: {