code cleanup + code check + preparing HACS

.eslintrc.yml

@@ -0,0 +1,23 @@
+extends: airbnb-base
+rules:
+  no-else-return: 0
+  no-underscore-dangle: 0
+  nonblock-statement-body-position: 0
+  curly: 0
+  no-return-assign: 0
+  consistent-return: 0
+  no-mixed-operators: 0
+  class-methods-use-this: 0
+  no-nested-ternary: 0
+  camelcase: 0
+  no-unused-vars: 0
+  quotes: 0
+  comma-dangle: 0
+  import/no-unresolved: 0
+  import/prefer-default-export: 0
+  max-len: 0
+  array-callback-return: 0
+globals:
+  window: true
+  Event: true
+  customElements: true

.gitignore

@@ -0,0 +1 @@
+/node_modules/

.travis.yml

@@ -0,0 +1,7 @@
+language: node_js
+node_js:
+  - "10.16.0"
+script:
+  - npm run lint
+  - npm run rollup
+  - npm run babel