The URL and the body fields allow you to specify a special
tag (##tag_name##) which will
be replaced at hook execution. It is a feature that allows you to minimize
the number of hooks you have to maintain.
The complete list of tags:
- ##repo## - the repository name
- ##repo_url## - the URL of the repository
- ##commit## - the git's hash commit id
- ##commit_url## - the URL of the last commit
- ##branch## - the branch name just created or pushed to
- ##date## - the UTC date (example: 2016-01-15)
- ##time## - the UTC time (example: 00:36:23)
- ##timestamp## - the UNIX epoch (example: 1452810114)
- ##ip## - the IP address from where the push took place
- ##hook_id## - the id of the hook