ports/156091: Update calibre to 0.7.52

[dhn at FreeBSD.org]

Synopsis: Update calibre to 0.7.52

Responsible-Changed-From-To: freebsd-ports-bugs->stas
Responsible-Changed-By: dhn
Responsible-Changed-When: Thu Mar 31 15:58:21 UTC 2011
Responsible-Changed-Why: 
Over to maintainer.

http://www.freebsd.org/cgi/query-pr.cgi?pr=156091