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
import os, sys
sys.path.insert(0, os.path.dirname(os.path.dirname(__file__)))
import pkg_resources
pkg_resources.require('WebOb')