The addons module warning is currently causing issues with babel/JSPM due to the warning message getting parsed as a require statement. Adding a break using string concatenation appears to prevent any issues.
Example error using JSPM:
```
Error loading "react-addons-{addon}" from...
```
- Add missing object-assign dependency
- Add batchedUpdates to ReactDOMClient, rename the two addons to `unstable_`
- Delete react/addons/* (leaving react/addons with a slightly updated warning)
- Add README.md, LICENSE, PATENTS to each addons package