ros_comm: 1.9.55-0 in 'groovy/distribution.yaml' [bloom]

Increasing version of package(s) in repository `ros_comm` to `1.9.55-0`:

- distro file: `groovy/distribution.yaml`
- bloom version: `0.5.1`
- previous version for package: `1.9.50-0`

## message_filters

- No changes

## rosgraph

- No changes

## rosservice

- No changes

## rosout

- No changes

## roswtf

- No changes

## topic_tools

- No changes

## rosnode

- No changes

## rospy

- No changes

## roscpp

```
* fix compile problem with gcc 4.4 (#302 <https://github.com/ros/ros_comm/issues/302>)
```

## rosgraph_msgs

- No changes

## rostopic

- No changes

## ros_comm

- No changes

## rosbag

```
* fix return value on platforms where char is unsigned (#311 <https://github.com/ros/ros_comm/issues/311>)
```

## rosparam

- No changes

## std_srvs

- No changes

## rosmsg

- No changes

## xmlrpcpp

```
* fix compilation with clang (#291 <https://github.com/ros/ros_comm/issues/291>)
```

## rosmaster

- No changes

## roslaunch

- No changes

## rostest

```
* add missing boost component
```

## rosconsole

- No changes