rosh_core: 1.0.4-0 in 'hydro/distribution.yaml' [bloom]

Increasing version of package(s) in repository `rosh_core` to `1.0.4-0`:

- distro file: `hydro/distribution.yaml`
- bloom version: `0.5.10`
- previous version for package: `1.0.3-0`

## rosh

```
* warn if roscore isn't running (fixes #1 <https://github.com/OSUrobotics/rosh_core/issues/1>)
* Fixing calls to deprecated roslib.rosenv (fixes #2 <https://github.com/OSUrobotics/rosh_core/issues/2>)
* Contributors: Dan Lazewatsky
```

## rosh_core

- No changes

## roshlaunch

- No changes