Update ruby-net-http-persistent to 2.5.2.

Changes:
  * The proxy may be changed at any time.
  * The allowed SSL version may now be set via #ssl_version.
    Issue #16 by astera
  * Added Net::HTTP::Persistent#override_headers which allows overriding
  * Net::HTTP default headers like User-Agent.  See
    Net::HTTP::Persistent@Headers for details.  Issue #17 by andkerosine
  * net-http-persistent now complains if OpenSSL::SSL::VERIFY_PEER is equal to
    OpenSSL::SSL::VERIFY_NONE.
  * Bug fixes.

www/ruby-net-http-persistent/Makefile

@@ -1,6 +1,6 @@
-# $NetBSD: Makefile,v 1.3 2011/12/16 13:29:08 taca Exp $
+# $NetBSD: Makefile,v 1.4 2012/02/28 20:38:51 minskim Exp $
 
-DISTNAME=	net-http-persistent-2.3.2
+DISTNAME=	net-http-persistent-2.5.2
 CATEGORIES=	www
 
 MAINTAINER=	[email protected]

www/ruby-net-http-persistent/distinfo

@@ -1,5 +1,5 @@
-$NetBSD: distinfo,v 1.3 2011/12/16 13:29:08 taca Exp $
+$NetBSD: distinfo,v 1.4 2012/02/28 20:38:51 minskim Exp $
 
-SHA1 (net-http-persistent-2.3.2.gem) = f2f3cf3baf27b395f730daa2a5f703c75c76ed72
-RMD160 (net-http-persistent-2.3.2.gem) = 94ec8c06fff9341a9296a8b6a767a77a5b2698cd
-Size (net-http-persistent-2.3.2.gem) = 21504 bytes
+SHA1 (net-http-persistent-2.5.2.gem) = bd4d93a01e4e40b5ca864200329c4186a6d2aaa3
+RMD160 (net-http-persistent-2.5.2.gem) = 939683244a7a3b9111a35c897720d7d32fb12cf0
+Size (net-http-persistent-2.5.2.gem) = 24576 bytes