Handle stupid 0x0D bytes because browsers are stupid.

test/test_markup.rb

@@ -167,6 +167,21 @@ context "Markup" do
     assert_equal output, rendered
   end
 
+  test "code blocks with carriage returns" do
+    content = "a\r\n\r\n```ruby\r\nx = 1\r\n```\r\n\r\nb"
+    output = "<p>a</p>\n\n<p><div class=\"highlight\"><pre>" +
+             "<span class=\"n\">x</span> <span class=\"o\">=</span> " +
+             "<span class=\"mi\">1</span>\n</pre>\n</div></p>\n\n<p>b</p>\n"
+
+    index = @wiki.repo.index
+    index.add("Bilbo-Baggins.md", content)
+    index.commit("Add alpha.jpg")
+
+    page = @wiki.page("Bilbo Baggins")
+    rendered = Gollum::Markup.new(page).render
+    assert_equal output, rendered
+  end
+
   def relative_image(content, output)
     index = @wiki.repo.index
     index.add("greek/alpha.jpg", "hi")