Preparing release 2.3.1

[Michael Ströder]

David Leonard wrote:
>  Perhaps there might be some interest in people running buildbot slaves?
> (http://buildbot.net/)
> Michael, you could run a trusted buildmaster, and helpers would run
> buildslaves that connect to your master.

Frankly I don't have currently the time for diving into it.

We have so many dependencies, each deployer of python-ldap could have
different needs:
Python
OpenLDAP
Cyrus-SASL
Kerberos (MIT/heimdal)
OpenSSL

I'm rather reluctant to open that can of worms...

Ciao, Michael.