rocon_qt_gui: 0.7.4-0 in 'indigo/distribution.yaml' [bloom]

Increasing version of package(s) in repository `rocon_qt_gui` to `0.7.4-0`:

- upstream repository: https://github.com/robotics-in-concert/rocon_qt_gui.git
- release repository: https://github.com/yujinrobot-release/rocon_qt_gui-release.git
- distro file: `indigo/distribution.yaml`
- bloom version: `0.5.16`
- previous version for package: `0.7.3-0`

## concert_admin_app

- No changes

## concert_conductor_graph

- No changes

## concert_qt_make_a_map

- No changes

## concert_qt_map_annotation

- No changes

## concert_qt_service_info

- No changes

## concert_qt_teleop

- No changes

## rocon_gateway_graph

- No changes

## rocon_qt_app_manager

- No changes

## rocon_qt_gui

- No changes

## rocon_qt_library

```
* update setup.py to install submodules fixes #173 <https://github.com/robotics-in-concert/rocon_qt_gui/issues/173>
* Contributors: Jihoon Lee
```

## rocon_qt_listener

- No changes

## rocon_qt_master_info

- No changes

## rocon_qt_teleop

- No changes

## rocon_remocon

- No changes