chore(rollup): create rollup es2015 bundle config

Author: TylorS

rollup.es.js

@@ -0,0 +1,14 @@
+import buble from 'rollup-plugin-buble'
+
+export default {
+  entry: 'src/index.js',
+  dest: 'dist/multicast.es.js',
+  moduleName: 'mostMulticast',
+  sourceMap: true,
+  plugins: [
+    buble()
+  ],
+  globals: {
+    '@most/prelude': 'mostPrelude'
+  }
+}