Allow index access into enumerable proxy

lib/draper/decorated_enumerable_proxy.rb

@@ -26,6 +26,10 @@ module Draper
       @wrapped_collection == other
     end
 
+    def [](index)
+      @klass.new(@wrapped_collection[index], @context)
+    end
+
     def to_s
       "#<DecoratedEnumerableProxy of #{@klass} for #{@wrapped_collection.inspect}>"
     end

spec/draper/base_spec.rb

@@ -269,6 +269,12 @@ describe Draper::Base do
       subject_one.should_not == subject_two
     end
 
+    it "should allow decorated access by index" do
+      subject = ProductDecorator.decorate(paged_array)
+
+      subject[0].should be_instance_of ProductDecorator
+    end
+
     context '#all' do
       it "should return a decorated collection" do
         ProductDecorator.all.first.should be_instance_of ProductDecorator