ports/170166: science/pynn: Update to version 0.7.4

[sperber at FreeBSD.org]

Synopsis: science/pynn: Update to version 0.7.4

Responsible-Changed-From-To: freebsd-ports-bugs->sperber
Responsible-Changed-By: sperber
Responsible-Changed-When: Mon Oct 29 17:55:35 UTC 2012
Responsible-Changed-Why: 
I'll take it.

http://www.freebsd.org/cgi/query-pr.cgi?pr=170166