Support multi-project in a repository.
Support multi-project in a repository.

* tools/hook-scripts/commit-email.rb
  (parse_args): Add --multi-project option.
  (detect_project): New method.
  (make_subject): Modify Subject: if project is found.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@865038 13f79535-47bb-0310-9956-ffa450edef68

wbond/subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion