Missing file from previous patch

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7490 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activesupport/lib/active_support/core_ext/array/random_access.rb

@@ -0,0 +1,12 @@
+module ActiveSupport #:nodoc:
+  module CoreExtensions #:nodoc:
+    module Array #:nodoc:
+      module RandomAccess
+        # Return a random element from the array.
+        def rand
+          self[Kernel.rand(length)]
+        end
+      end
+    end
+  end
+end