Update React to 0.11.0

Remove react peerDependency as it creates an annoying npm error when upgrading to the latest react (`0.11.0`). See this[ issue](https://github.com/npm/npm/issues/5080#issuecomment-40545599) about peerDependencies and how they are not that great :cry:.
Updated react devDependency to `^0.11.0`