Add notify section in project.config

The notify section allows project owners to include emails to users
directly from project.config. This removes the need to create fake
user accounts to always BCC a group mailing list. For example:

  [notify "dev-group"]
    email = dev-team <dev-team@example.com>
    filter = branch:master visibleto:dev

Internal groups may also be used as a mailing list, automatically
BCCing any user that is a member of the group if the group can see
the change:

  [access "refs/heads/*"]
    read = group Developers
  [notify "reviewers"]
    email = group Developers

Change-Id: I02bd05b562e420a4742ff27ffacad8f20648e4f0
17 files changed