Support batch processing for large project which has many git repositories.

You can use just 'run.at' script

$ run.at [target_directory_which_contains_git_repos]

EXAMPLES
========

$ run.at /home/woogon.shim/src/mega-project/
Add usage of batch script
Storing total modified files count of git to 'file-count' file.
Merge branch 'feature/batch-execution' into develop