genpy: 0.5.1-0 in 'indigo/distribution.yaml' [bloom]

Increasing version of package(s) in repository `genpy` to `0.5.1-0`:

- distro file: `indigo/distribution.yaml`
- bloom version: `0.5.5`
- previous version for package: `0.5.0-0`

## genpy

```
* resolve message classes from dry packages (ros/ros_comm#293 <https://github.com/ros/ros_comm/issues/293>)
* add architecture_independent flag in package.xml (#27 <https://github.com/ros/genpy/issues/27>)
```