Add script for changelog from subdirectory inforormation

(create_changelog.sh) : Add script for changelog from subdirectory information
This is discussed in https://github.com/jsk-ros-pkg/jsk_roseus/pull/134

**However**, I have one question about catkin subdirectory.
Currently, default argument is set for rosbuild environment.
In rosbuild environment, hrpsys-base-source is located in ``$(rospack find hrpsys)/build/hrpsys-base-source``.

In catkin environment, hrpsys-base-source is located in 
``~/ros/hydro/build/rtm-ros-robotics/openrtm_common/hrpsys/build/hrpsys-base-source`` in my PC.
How can I get this kind of path in the generic way?
@snozawa, this line will not work on catkin environment, use \`rospack find hrpsys\`/CHANGELOG.rst, or
remove SUB_DIRECTORIES, but use something like TARGET_DIRECTORY and SOURCE_DIRECTORY