Version bump to 0.8.3.1
Version bump to 0.8.3.1

The previous commit contains a moderately important bugfix that we want
to keep track of.  To make this easier, I'm bumping the version to
0.8.3.1.

pyfarm/pyfarm-agent,guidow/pyfarm-agent,pyfarm/pyfarm-agent,pyfarm/pyfarm-agent,guidow/pyfarm-agent,guidow/pyfarm-agent