Add WebStorm option for bundle updates

Moving discussion from #23. Would like to hear what JetBrains has to say about this before even thinking about merging.

https://youtrack.jetbrains.com/issue/WEB-12496

@Odalrick you can change your `package.json` for now to just grab from git at the head of the branch. Let me know if it works. 


```json
{
  "devDependencies": {
    "karma-bro": "bendrucker/karmo-bro#webstorm"
  }
}
```