Update the 3.0.12 release date

git-svn-id: http://svn6.assembla.com/svn/pyfits/branches/3.1-stable@2372 ed100bfc-0583-0410-97f2-c26b58777a21
Remove the checks for whether the released project is 'pyfits'--these are not necessary since the release hooks are no longer installed as setuptools entry points

git-svn-id: http://svn6.assembla.com/svn/pyfits/branches/3.1-stable@2373 ed100bfc-0583-0410-97f2-c26b58777a21
Update the releaser hooks to tweak how tags are created--this is taken right out of Astropy, and I had forgotten this wasn't the default behavior of zest.releaser...

git-svn-id: http://svn6.assembla.com/svn/pyfits/branches/3.1-stable@2374 ed100bfc-0583-0410-97f2-c26b58777a21