Refactor: Don't include package.json into dist files

Instead of including package.json file into the build files.
Use webpacks DefinePlugin to define a global lib version.

.eslintrc.js

@@ -15,5 +15,8 @@ module.exports = {
     'arrow-parens': 0,
     // allow debugger during development
     'no-debugger': process.env.NODE_ENV === 'production' ? 2 : 0
+  },
+  "globals": {
+    "LIB_VERSION": true
   }
 }