ports/178972: ports/math/py-networkx update to from 1.6 to 1.7

[edwin at FreeBSD.org]

Synopsis: ports/math/py-networkx update to from 1.6 to 1.7

Responsible-Changed-From-To: freebsd-ports-bugs->freebsd-python
Responsible-Changed-By: edwin
Responsible-Changed-When: Sat May 25 15:20:17 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=178972