Move package metadata into setup.py

This PR moves the package metadata out of the ``blogofile_blog`` module and into ``setup.py``.  The motivation for this is to allow ``python setup.py bdist_egg`` to work without having Blogofile installed.

In turn this allows for blogofile_blog and blogofile to be installed in a single pip run (using a pip requirements file, say).  Also it make it possible to install blogofile_blog and blogofile using buildout without extreme pain.