Tagged as v1.0.post1, mainly for the version number in setup.py

The tags 'easyinstall' and 'v1.0' in the previous Subversion
repository seem to be translated to lightweight tags in Git.
Therefore we need another tag of 'annotate' type for `git describe`
to respond properly (and to be used as a version string in setup.py).

The tag 'v1.0.post1' was chosen to respect the existing one,
'v1.0'.  '.post1' was added to address this is a "Post-release"
in the sense of PEP 440 https://www.python.org/dev/peps/pep-0440/.

Note that 'v1.0' is not comply with the PEP; to do so we may
need to change this versioning scheme in the future (using
EPOCH notation?).

moving the easy_install tag from branches to tags

Tagging the 1.0 release, soon after the Nicolo's leave