* lib/ipaddr.rb: Inhibit zero-filled octets in an IPv4 address in
	  all platforms. [ruby-dev:45671]

	* lib/ipaddr.rb: Allow the x:x:x:x:x:x:d.d.d.d form not limited to
	  IPv4 mapped/compatible addresses.  This change also makes it
	  possible for the parser to understand IPv4 mapped and compatible
	  IPv6 addresses in non-compressed form.

	* lib/ipaddr.rb: Stop exposing IPSocket.valid*? methods which were
	  only usable on non-IPv6-ready platforms.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@35917 b2dd03c8-39d4-4d8f-98ff-823fe69b080e