Include project_id in webhook payload.
Added links to submodules
Remove .git from project url end redirect

Ex. redirect from
  localhost/group/project.git
to
  localhost/group/project

It used to prevent 404 error when follow submodule http link
like http://localhost/group/project.git
Merge branch 'web_hook_project_id' of /home/git/repositories/gitlab/gitlabhq
Merge branch 'master' of dev.gitlab.org:gitlab/gitlabhq