diff --git a/Gemfile b/Gemfile
index d65e2a6..fa75df1 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,3 +1,3 @@
-source 'http://rubygems.org'
+source 'https://rubygems.org'
 
 gemspec
diff --git a/Gemfile.lock b/Gemfile.lock
index eff3539..00a76ba 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,14 +1,17 @@
 PATH
   remote: .
   specs:
-    nokogiri-plist (0.4.1)
+    nokogiri-plist (0.5.0)
       nokogiri
 
 GEM
-  remote: http://rubygems.org/
+  remote: https://rubygems.org/
   specs:
+    mini_portile (0.6.2)
     mocha (0.9.12)
-    nokogiri (1.4.4)
+    nokogiri (1.6.6.2)
+      mini_portile (~> 0.6.0)
+    rake (0.9.6)
     shoulda (2.11.3)
 
 PLATFORMS
@@ -17,4 +20,8 @@ PLATFORMS
 DEPENDENCIES
   mocha
   nokogiri-plist!
+  rake
   shoulda
+
+BUNDLED WITH
+   1.10.6
diff --git a/Rakefile b/Rakefile
index ba605a2..b32dd7f 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,7 +1,6 @@
 require 'rake/testtask'
 
 Rake::TestTask.new :test do |t|
-  require 'redgreen' if Gem.available?('redgreen')
   t.libs << 'lib'
   t.pattern = 'test/**/test_*.rb'
   t.verbose = true
diff --git a/lib/core_ext/string.rb b/lib/core_ext/string.rb
deleted file mode 100644
index a3b23d5..0000000
--- a/lib/core_ext/string.rb
+++ /dev/null
@@ -1,7 +0,0 @@
-String.class_eval do
-
-  define_method :to_plist do
-    Nokogiri::PList(self)
-  end
-
-end
diff --git a/lib/nokogiri-plist.rb b/lib/nokogiri-plist.rb
index d4bebe7..2a0226e 100644
--- a/lib/nokogiri-plist.rb
+++ b/lib/nokogiri-plist.rb
@@ -14,6 +14,4 @@
 require 'nokogiri-plist/node'
 require 'nokogiri-plist/plist'
 
-require 'core_ext/string'
-
-Nokogiri::XML::Node.send :include, NokogiriPList::Node
\ No newline at end of file
+Nokogiri::XML::Node.send :include, NokogiriPList::Node
diff --git a/nokogiri-plist.gemspec b/nokogiri-plist.gemspec
index de70391..37bac18 100644
--- a/nokogiri-plist.gemspec
+++ b/nokogiri-plist.gemspec
@@ -15,8 +15,9 @@ Gem::Specification.new do |s|
 
   s.required_rubygems_version = ">= 1.3.6"
 
-  s.add_development_dependency 'shoulda'
   s.add_development_dependency 'mocha'
+  s.add_development_dependency 'rake'
+  s.add_development_dependency 'shoulda'
 
   s.add_dependency 'nokogiri'
 
diff --git a/test/nokogiri-plist/test_generator.rb b/test/nokogiri-plist/test_generator.rb
index 22f83af..1990834 100644
--- a/test/nokogiri-plist/test_generator.rb
+++ b/test/nokogiri-plist/test_generator.rb
@@ -1,4 +1,4 @@
-require 'test/test_helper'
+require_relative '../test_helper'
 
 class NokogiriPList::GeneratorTest < Test::Unit::TestCase
 
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 8c1e158..d5b7580 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -5,4 +5,4 @@
 ROOT = File.join(File.expand_path(File.dirname(__FILE__)), '..')
 
 $LOAD_PATH.unshift(ROOT)
-require File.join('nokogiri-plist.rb')
\ No newline at end of file
+require File.join('nokogiri-plist.rb')
diff --git a/test/test_string.rb b/test/test_string.rb
deleted file mode 100644
index 4f18aca..0000000
--- a/test/test_string.rb
+++ /dev/null
@@ -1,15 +0,0 @@
-require 'test/test_helper'
-
-class StringTest < Test::Unit::TestCase
-
-  context ".to_plist" do
-
-    should "calls PList parser with itself" do
-      Nokogiri.expects(:PList).with("this is a test")
-
-      "this is a test".to_plist
-    end
-
-  end
-
-end
\ No newline at end of file