Reorg into panels (#75)

rollup/demo.js

@@ -3,6 +3,6 @@ import config from './base-config';
 export default Object.assign({}, config, {
   entry: 'home-assistant-js/demo_data/expose_window.js',
   targets: [
-    { dest: 'build/_demo_data_compiled.js', format: 'iife' },
+    { dest: 'build-temp/demo_data.js', format: 'iife' },
   ],
 });