adds julia set example (#419)

* adds julia set example

* fixes indentation in *.js files

* fixes *.js formatting

* fixes a typo in function arguments signature

examples/julia_set/webpack.config.js

@@ -0,0 +1,13 @@
+const path = require('path');
+
+module.exports = {
+    entry: './index.js',
+    output: {
+        path: path.resolve(__dirname, 'dist'),
+        filename: 'index.js',
+    },
+    mode: 'development',
+    devServer: {
+        open: true
+    }
+};