Add vcs-load-dirs project to thirdparty directory.
vcs-load-dirs project contains load-dir scripts for different version control sysystems including git, hg, darcs, bazaar.
More information about the project:
http://software.complete.org/software/wiki/vcs-load-dirs/
http://software.complete.org/static/vcs-load-dirs/doc//hg_load_dirs.1.html