Log Message:
Update to 0.8.0:

* Release 0.8.0 (15-Apr-2015)

** UnauthenticatedTub is gone

As announced in the previous release, UnauthenticatedTub has been removed.
All Tubs are fully authenticated now.

** Security Improvements

Foolscap now generates better TLS certificates, with 2048-bit RSA keys and
SHA256 digests. Previous versions used OpenSSL's defaults, which typically
meant 1024-bit MD5.

To benefit from the new certificates, you must regenerate your Tubs, which
means creating new FURLs (with new TubIDs). Previously-created Tubs will
continue to work normally: only new Tubs will be different.

** Packaging/Dependency Changes

setup.py now requires setuptools

Foolscap now requires pyOpenSSL unconditionally, because all Tubs are
authenticated.

We now recommend "pip install ." to install Foolscap and all its
dependencies, instead of "python setup.py install". See #231 for details.