Add script to change contributors name in CHANGELOG.py

A script to remove stupid job to replace handle to name.

1. `$ catkin_generate_changelog`
2. `$ find . -name CHANGELOG.rst -exec rosrun jsk_tools force_to_rename_changelog_user.py {} \;`
3. `$ find . -name CHANGELOG.rst -exec vim {} \;`
4. `$ catkin_prepare_release`