nodelet_core: 1.9.0-0 in 'indigo/distribution.yaml' [bloom]

Increasing version of package(s) in repository `nodelet_core` to `1.9.0-0`:

- distro file: `indigo/distribution.yaml`
- bloom version: `0.5.9`
- previous version for package: `1.8.3-1`

## nodelet

```
* Fix initialization error handling (#13 <https://github.com/ros/nodelet_core/issues/13>)
* Contributors: Esteve Fernandez
```

## nodelet_core

- No changes

## nodelet_topic_tools

- No changes