Preparing a release

Notes on creating a release. These notes apply my own system, currently OS X 10.9, with mpfr and gmp installed via MacPorts.

Make sure that you have a clean and up-to-date source tree.
Create a release branch:
```
git checkout release/0.4.0
```
Update version numbers if necessary. Places that need to be updated include:
```
docs/conf.py ('version' and 'release' keys)
setup.py ('version')
```
You might also look at:
- CHANGELOG.rst
- INSTALL.rst
- RELEASING.rst (this document).
Create a test release with python setup.py sdist; copy the generated tarball and check that it's possible to install from it. Run tests.
When satisfied, tag the release:
```
git tag -a v0.4.0
```
Upload the release to PyPI. Register first if necessary:
```
python setup.py sdist upload
```
If you don't have PyPI details registered in ~/.pypirc, this may fail; in that case you'll need to reissue the 'python setup.py sdist upload' command in the form:
```
python setup.py sdist register upload
```
Make sure you answer "y" to the "Save your login (y/N)" prompt!
Update tags on ReadTheDocs.
Building docs to upload to PyPI. In the docs directory, do:
```
make html
cd build/html
zip -r bigfloat_docs.zip *
mv -i bigfloat_docs.zip ~/Desktop
```
Now you can go to:
```
http://pypi.python.org/pypi?%3Aaction=pkg_edit&name=bigfloat
```
and upload the documentation from there. The documentation is uploaded to http://pythonhosted.org/bigfloat.

Post-release