Added rollup for Tree-shaking

rollup-server.js

@@ -0,0 +1,18 @@
+import rollup      from 'rollup'
+import nodeResolve from 'rollup-plugin-node-resolve'
+import commonjs    from 'rollup-plugin-commonjs';
+import uglify      from 'rollup-plugin-uglify'
+
+export default {
+    entry: 'dist/server/index.js',
+    dest: 'dist/server/build.js',
+    sourceMap: false,
+    format: 'iife',
+    plugins: [
+        nodeResolve({jsnext: true, module: true}),
+        commonjs({
+            include: 'node_modules/rxjs/**',
+        }),
+        uglify()
+    ]
+}