use webpack3 and uglify-es, reduces module size

Author: Tom

.babelrc

@@ -0,0 +1,11 @@
+{
+  "presets": [
+    ["env", {
+      "targets": {
+        "browsers": ["chrome 58", "firefox 53"]
+      },
+      "modules": false,
+      "loose": false
+    }]
+  ]
+}

LSystemWorker.js

@@ -1,6 +1,6 @@
 // Require instead of importScripts because we use webpack
 // with worker-loader for compiling source: https://github.com/webpack/worker-loader
-let LSystem = require('lindenmayer');
+import LSystem from 'lindenmayer';
 let lsystem = new LSystem({});
 let timeout = {};