Adding commit message and committer e-mail to Git webhook

In Git Webhook is missing Committer e-mail and commit message. I don't understant why, other hooks has commit message. This should fix it. 

With this PR, I can hav phpci on my local machine and add Git Hook like that: [post-commit](https://gist.github.com/PetrHudik/d4fd7610c81a5eb5f673).