Add build using polymer-build (#344)

* Add build using polymer-build

* Use bundle strategies to tweak stripExcludes

* Only vulcanize hass.io panel

* Rename hassio panel generate script

* Remove hydrolysis

* Get it all somewhat working

* Fixes

* Allow ES2015 + fix minify JS

* Clarify we need to fix service worker minify

* Move service worker template out of tasks folder

* Fix broken CSS

* Wrap it up

* Fix maps

panels/hassio/todo.md

@@ -1,13 +0,0 @@
-Host:
- - Use feature detection
-
-Supervisor:
- - logs
- - toggle beta channel (/options)
-
-Network:
- - show
- - update
-
-Home Assistant:
- - Logs

panels/map/ha-panel-map.html

@@ -8,13 +8,12 @@
 <link rel="import" href="./ha-entity-marker.html">
 
 <dom-module id="ha-panel-map">
+  <!-- this is somehow magically working with bundling, leave it for now -->
+  <link
+    rel="stylesheet"
+    href="../../bower_components/leaflet/dist/leaflet.css"
+  />
   <template>
-    <link
-      id='stylesheet'
-      rel="stylesheet"
-      href="../../bower_components/leaflet/dist/leaflet.css"
-    />
-
     <style include="ha-style">
       #map {
         height: calc(100% - 64px);
@@ -58,7 +57,11 @@ Polymer({
     // The link tag is resolved relative to the _current_ url instead of the
     // source HTML file. Vulcanized this is taken care off. Fix it in dev.
     if (window.HASS_DEV) {
-      this.$.stylesheet.href = '/static/home-assistant-polymer/bower_components/leaflet/dist/leaflet.css';
+      var style = document.createElement('link');
+      style.setAttribute(
+        'href', '/static/home-assistant-polymer/bower_components/leaflet/dist/leaflet.css');
+      style.setAttribute('rel', 'stylesheet');
+      this.shadowRoot.appendChild(style);
     }
     var map = this._map = window.L.map(this.$.map);
     map.setView([51.505, -0.09], 13);