Added a spec related to cucumber#165

lib/cucumber/constantize.rb

@@ -7,7 +7,7 @@ def constantize(camel_cased_word)
         names = camel_cased_word.split('::')
         names.shift if names.empty? || names.first.empty?
 
-        constant = Object
+        constant = ::Object
         names.each do |name|
           constant = constant.const_defined?(name) ? constant.const_get(name) : constant.const_missing(name)
         end

spec/cucumber/constantize_spec.rb

@@ -0,0 +1,12 @@
+require 'spec_helper'
+
+module Cucumber
+  describe Constantize do
+    include Constantize
+
+    it "loads html formatter" do
+      clazz = constantize('Cucumber::Formatter::Html')
+      clazz.name.should == 'Cucumber::Formatter::Html'
+    end
+  end
+end