Make Travis to release the npm package

Add .npmignore to include dist/*.js files to the npm release (but exclude zip files). See https://docs.travis-ci.com/user/deployment/npm/

Author: simonbrunel

.npmignore

@@ -0,0 +1,8 @@
+/.git
+/dist/*.zip
+/node_modules
+/scripts
+
+.codeclimate.yml
+.gitignore
+.travis.yml

.travis.yml

@@ -28,3 +28,9 @@ deploy:
   skip_cleanup: true
   on:
     tags: true
+- provider: npm
+  email: $NPM_AUTH_EMAIL
+  api_key: $NPM_AUTH_TOKEN
+  skip_cleanup: true
+  on:
+    tags: true