Add .npmignore back to root

.npmignore

@@ -0,0 +1,18 @@
+.appveyor.yml
+.editorconfig
+.eslintrc
+.github
+.gitignore
+.gitpod.yml
+.npmignore
+.nyc_output
+.prettierignore
+.sasslintrc
+.travis.yml
+backstop.config.js
+bower.json
+changelog.md
+composer.json
+package.js
+package.json
+test