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

gulpfile.babel.js

@@ -1,31 +1,3 @@
-'use strict';
+var requireDir = require('require-dir');
 
-import gulp from 'gulp';
-import rollupEach from 'gulp-rollup-each';
-import rollupConfig from './rollup.config';
-
-gulp.task('run_rollup', () => {
-  return gulp.src([
-    'js/core.js',
-    'js/compatibility.js',
-    'js/editor/editor.js',
-    'demo_data/demo_data.js',
-  ])
-  .pipe(rollupEach(rollupConfig))
-  .pipe(gulp.dest('build-temp'));
-});
-
-gulp.task('ru_all', ['run_rollup'], () => {
-  gulp.src([
-    'build-temp/core.js',
-    'build-temp/compatibility.js',
-  ])
-  .pipe(gulp.dest('build/'));
-});
-
-gulp.task('watch_ru_all', ['ru_all'], () => {
-  gulp.watch([
-    'js/**/*.js',
-    'demo_data/**/*.js'
-  ], ['ru_all']);
-});
+requireDir('./gulp/tasks/');