ports/184523: Update devel/py-robotframework to version 2.8.3

[edwin at FreeBSD.org]

Synopsis: Update devel/py-robotframework to version 2.8.3

Responsible-Changed-From-To: freebsd-ports-bugs->freebsd-python
Responsible-Changed-By: edwin
Responsible-Changed-When: Thu Dec 5 20:20:08 UTC 2013
Responsible-Changed-Why: 
freebsd-python@ wants this port PRs (via the GNATS Auto Assign Tool)

http://www.freebsd.org/cgi/query-pr.cgi?pr=184523