Log Message:
Update ruby-nokogiri to 1.5.2.

== 1.5.2 / 2012-03-09

Repackaging of 1.5.1 with a gemspec that is compatible with older Rubies. #631, #632.

== 1.5.1 / 2012-03-09

* Features

  * XML::Builder#comment allows creation of comment nodes.
  * CSS searches now support namespaced attributes. #593
  * Java integration feature is added. Now, XML::Document.wrap
    and XML::Document#to_java methods are available.
  * RelaxNG validator support in the `nokogiri` cli utility. #591 (thanks, Dan \ 
Radez!)

* Bugfixes

  * Fix many memory leaks and segfault opportunities. Thanks, Tim Elliott!
  * extconf searches homebrew paths if homebrew is installed.
  * Inconsistent behavior of Nokogiri 1.5.0 Java #620
  * Inheriting from Nokogiri::XML::Node on JRuby (1.6.4/5) fails #560
  * XML::Attr nodes are not allowed to be added as node children, so an
    exception is raised. #558
  * No longer defensively "pickle" adjacent text nodes on
    Node#add_next_sibling and Node#add_previous_sibling calls. #595.
  * Java version inconsistency: it returns nil for empty attributes #589
  * to_xhtml incorrectly generates <p /></p> when tag is empty #557
  * Document#add_child now accepts a Node, NodeSet, DocumentFragment,
    or String. #546.
  * Document#create_element now recognizes namespaces containing
    non-word characters (like "SOAP-ENV"). This is mostly relevant to
    users of Builder, which calls Document#create_element for nearly
    everything. #531.
  * File encoding broken in 1.5.0 / jruby / windows #529
  * Java version does not return namespace defs as attrs for ::HTML #542
  * Bad file descriptor with Nokogiri 1.5.0 #495
  * remove_namespace! doesn't work in pure java version #492
  * The Nokogiri Java native build throws a null pointer exception
    when ActiveSupport's .blank? method is called directly on a parsed
    object. #489
  * 1.5.0 Not using correct character encoding #488
  * Raw XML string in XML Builder broken on JRuby #486
  * Nokogiri 1.5.0 XML generation broken on JRuby #484
  * Do not allow multiple root nodes. #550
  * Fixes for custom XPath functions. #605, #606 (thanks, Juan Wajnerman!)
  * Node#to_xml does not override :save_with if it is provided. #505
  * Node#set is a private method [JRuby]. #564 (thanks, Nick Sieger!)
  * C14n cleanup and Node#canonicalize (thanks, Ivan Pirlik!) #563