Use rollup instead of webpack for the full build

config/rollup.js

@@ -0,0 +1,21 @@
+// Rollup configuration for the full build
+
+import noderesolve from 'rollup-plugin-node-resolve';
+import commonjs from 'rollup-plugin-commonjs';
+import {uglify} from 'rollup-plugin-uglify';
+import buble from 'rollup-plugin-buble';
+import sourcemaps from 'rollup-plugin-sourcemaps';
+
+export default {
+  input: 'src/index.js',
+  output: [
+    {file: 'build/ol.js', format: 'iife', sourcemap: true}
+  ],
+  plugins: [
+    noderesolve(),
+    commonjs(),
+    buble(),
+    uglify(),
+    sourcemaps()
+  ]
+};

config/webpack.js

@@ -1,14 +0,0 @@
-const webpack = require('webpack');
-const MinifyPlugin = require('babel-minify-webpack-plugin');
-
-module.exports = {
-  entry: './src/index.js',
-  output: {
-    filename: 'build/ol.js'
-  },
-  devtool: 'source-map',
-  plugins: [
-    new webpack.optimize.ModuleConcatenationPlugin(),
-    new MinifyPlugin()
-  ]
-};