title: virtualenv relocatable -- does it really work
body: <p>I kept looking for answer but didn't find one.
  I have a virtual env dir, a project dir with a req.txt.
  When I run pip -r req.txt, it installs some apps from github (source) and some from pypi.
  The ones from pypi are fine after relocatable call on the virtual evn, however the links in the site-packages for the apps that it installed from github still point to the old directory location.</p>
  
  <p>Anyone else has seen this behavior? Any quick way around it?
  Also, relocatable is not honoring the --no-site-packages flag that was used on the virtualenv originally. Once you move the virtual and reactivate it, everything is visible from the system's site-packages. Docs indicates this behavior as a fact, so I am wondering if there is any quick way around this?</p>