[Distutils] pip and virtualenv release candidates

[Marcus Smith]

pip-1.4rc4 and virtualenv-1.10rc7 are now available

the changes from the previous RCs:
 - virtualenv now contains setuptools v0.9.1

here's the RC install instructions again:

  $ curl -L -O https://github.com/pypa/virtualenv/archive/1.10rc7.tar.gz
  $ tar zxf 1.10rc7.tar.gz
  $ python virtualenv-1.10rc7/virtualenv.py myVE
  $ myVE/bin/pip --version
   pip 1.4rc4
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