Fix status initialization when custom status provided

Signed-off-by: Santiago Pastorino <santiago@wyeworks.com>

actionpack/lib/action_dispatch/http/response.rb

@@ -44,8 +44,8 @@ module ActionDispatch # :nodoc:
         @block = nil
         @length = 0
 
-        @status, @header = status, header
-        self.body = body
+        @header = header
+        self.body, self.status = body, status
 
         @cookie = []
         @sending_file = false

actionpack/test/dispatch/response_test.rb

@@ -18,6 +18,10 @@ class ResponseTest < ActiveSupport::TestCase
     body.each { |part| parts << part }
     assert_equal ["Hello, World!"], parts
   end
+  
+  test "status handled properly in initialize" do
+    assert_equal 200, ActionDispatch::Response.new('200 OK').status
+  end
 
   test "utf8 output" do
     @response.body = [1090, 1077, 1089, 1090].pack("U*")