Ensure the request body gets recorded with FakeWeb/Net::HTTP.

For some reason, Net::HTTP provides `request_body` (passed as an extra argument) and `request.body` on the request argument...and sometimes the request body is on one or the other.

Closes vcr#127.

lib/vcr/library_hooks/fakeweb.rb

@@ -113,7 +113,7 @@ def vcr_request
           @vcr_request ||= VCR::Request.new \
             request.method.downcase.to_sym,
             uri,
-            request_body,
+            (request_body || request.body),
             request.to_hash
         end
 

spec/vcr/library_hooks/fakeweb_spec.rb

@@ -48,6 +48,15 @@ def directly_stub_request(method, url, response_body)
       VCR.stub(:real_http_connections_allowed? => true)
     end
 
+    it 'records the request body when using #post_form' do
+      VCR.should_receive(:record_http_interaction) do |interaction|
+        interaction.request.body.should eq("q=ruby&max=50")
+      end
+
+      uri = URI("http://localhost:#{VCR::SinatraApp.port}/foo")
+      Net::HTTP.post_form(uri, 'q' => 'ruby', 'max' => '50')
+    end
+
     it "does not record headers for which Net::HTTP sets defaults near the end of the real request" do
       VCR.should_receive(:record_http_interaction) do |interaction|
         interaction.request.headers.should_not have_key('content-type')