[Distutils] pip and virtualenv release candidates

[Marcus Smith]

pip-1.4rc4 and virtualenv-1.10rc6 are now available

the changes from the previous RCs:
- virtualenv now contains setuptools v0.9 (which enables indexes to use
md5, sha1, or one of the sha2 variants in their urls)
- the new "pip install --pre" option now applies to all packages installed
in the command, not just top-level requirements
- pip support for building and installing pybundles is now noted as
deprecated (our plan is to remove it in v1.5)

here's the RC install instructions again:

  $ curl -L -O https://github.com/pypa/virtualenv/archive/1.10rc6.tar.gz<https://github.com/pypa/virtualenv/archive/1.10rc4.tar.gz>
  $ tar zxf 1.10rc6.tar.gz
  $ python virtualenv-1.10rc6/virtualenv.py myVE
  $ myVE/bin/pip --version
   pip 1.4rc4
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