rexml: disable XPath 1.0 compatible "#{ELEMENT_NAME}" processing by default

It breaks backward compatibility than I thought. So it's disabled by
default. It means that REXML's XPath processor isn't compatible with
XPath 1.0. But it will be acceptable for users.

We can enable it by specifying "strict: true" to
REXML::XPathParser.new explicitly.

* lib/rexml/xpath.rb,
  lib/rexml/xpath_parser.rb: Accept "strict: true" option.

* test/rexml/test_contrib.rb,
  test/rexml/xpath/test_base.rb: Use not XPath 1.0 compatible behavior.

* test/rexml/test_jaxen.rb: Use XPath 1.0 compatible behavior.

* test/rss/test_1.0.rb,
  test/rss/test_dublincore.rb,
  spec/ruby/library/rexml/element/namespace_spec.rb,
  spec/ruby/library/rexml/element/namespaces_spec.rb,
  spec/ruby/library/rexml/element/prefixes_spec.rb: Enable again.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63278 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

spec/ruby/library/rexml/element/namespace_spec.rb

@@ -1,8 +1,6 @@
 require 'rexml/document'
 require_relative '../../../spec_helper'
 
-=begin
-# FIXME
 describe "REXML::Element#namespace" do
   before :each do
     @doc = REXML::Document.new("<a xmlns='1' xmlns:y='2'><b/><c xmlns:z='3'/></a>")
@@ -27,4 +25,3 @@ describe "REXML::Element#namespace" do
     @elem.namespace("z").should be_nil
   end
 end
-=end

spec/ruby/library/rexml/element/namespaces_spec.rb

@@ -7,7 +7,6 @@ describe "REXML::Element#namespaces" do
     @elem = doc.elements["//c"]
   end
 
-=begin
   it "returns a hash of the namespaces" do
     ns = {"y"=>"2", "z"=>"3", "xmlns"=>"1"}
     @elem.namespaces.keys.sort.should == ns.keys.sort
@@ -29,5 +28,4 @@ describe "REXML::Element#namespaces" do
     values = ["2", "3", "1"]
     @elem.namespaces.values.sort.should == values.sort
   end
-=end
 end

spec/ruby/library/rexml/element/prefixes_spec.rb

@@ -7,7 +7,6 @@ describe "REXML::Element#prefixes" do
     @elem = doc.elements["//c"]
   end
 
-=begin
   it "returns an array of the prefixes of the namespaces" do
     @elem.prefixes.should == ["y", "z"]
   end
@@ -15,7 +14,6 @@ describe "REXML::Element#prefixes" do
   it "does not include the default namespace" do
     @elem.prefixes.include?("xmlns").should == false
   end
-=end
 
   it "returns an empty array if no namespace was defined" do
     doc = REXML::Document.new "<root><something/></root>"