Fixes #26 (no prepending slash in url to filename path conversion) and #36 (look for bin/python.exe which is used by buildout)

Applied patch from ticket 35, adds option to allow access to global site-packages if a virtual environment is to be created

Fix how bundle files are moved around, moving them first before creating requirements so the requirements point to the right destination locations

[svn r21811] Don't use sys.exit directly.  Put install record in .egg-info/ directory.  Add --simulate and --path to pip zip