title: How to get rid of "dev" postfix in version number when packaging a python module with devpi
body: <p>I use <a href="http://doc.devpi.net/latest/" rel="nofollow">devpi</a> to deploy python modules. When I upload packages via <code>devpi upload</code> the generated module name always contains the 'dev' postfix after the version number. When I try to install those packages using <code>pip install ...</code> I have to specify the <code>--pre</code> flag. How do I get rid of this 'pre' postfix? I assume that I somehow have to mark the module as release version, but I have no clue how.</p>