Merge pull request #20 from WoogonShim/develop

Develop
Remove committer data.

In git, author and committer is same in normal case. Author and committer is different in case that author send a patch of their changes to someone has authority of committing central repository. (different author and committer is in Gerrit merge commit only)
Merge pull request #21 from WoogonShim/feature/collect-author

Remove committer data.
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