Naming Convention Violations for Variables in RosPackageTemplate

[neriyashul]

The member variables in the RosPackageTemplate package of this repository are not following the recommended naming conventions outlined in the ROS C++ Style Guide.

According to ROS style guide, member variables should be named using under_scored, while in the current implementation, camelCase is used.

For example, in the RosPackageTemplate class:

- serviceServer_
- subscriberTopic_
- nodeHandle_

I have no problem making a pull request to address this issue if needed.