Released v15.0.0

* Remove the `virtualenv-N.N` script from the package; this can no longer be correctly created from a wheel installation.
  Resolves :issue:`851`, :issue:`692`

* Remove accidental runtime dependency on pip by extracting certificate in the
  subprocess.

* Upgrade setuptools 20.2.2.

* Upgrade pip to 8.1.0.
-----BEGIN PGP SIGNATURE-----
Comment: GPGTools - https://gpgtools.org
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=RPMj
-----END PGP SIGNATURE-----