Add npm and minified builds

webpack.config.js

@@ -1,7 +1,7 @@
 const webpack = require('webpack');
 const fs = require('fs');
 const path = require('path');
-
+const UglifyJSPlugin = require('uglifyjs-webpack-plugin');
 const pkg = JSON.parse(fs.readFileSync(path.resolve(__dirname, 'package.json')));
 
 const banner =
@@ -36,6 +36,16 @@ module.exports = [
         module: modules,
         plugins
     },
+    {
+        entry: './src/index.js',
+        output: {
+            filename: './dist/html2canvas.min.js',
+            library: 'html2canvas',
+            libraryTarget: 'umd'
+        },
+        module: modules,
+        plugins: plugins.concat([new UglifyJSPlugin(), new webpack.BannerPlugin(banner)])
+    },
     {
         entry: './src/renderer/RefTestRenderer.js',
         output: {