fix undefined method error when textile ends with a NOTE

lib/guides/textile_transformer.rb

@@ -69,7 +69,7 @@ def scan_until(regex)
     end
 
     def consume_note(css_class)
-      match = scan_until /(\r?\n){2,}/ # We need at least 2 line breaks but we want to match as many as exist
+      match = scan_until /((\r?\n){2,}|\z)/ # We need at least 2 line breaks but we want to match as many as exist
       note = match.pre_match.gsub(/\n\s*/, " ")
       note = RedCloth.new(note, [:lite_mode]).to_html
       @output << %{<div class="#{css_class}"><p>#{note}</p></div>\n}

spec/textile_transformer_spec.rb

@@ -59,6 +59,11 @@
       %{<p>Another paragraph</p>\n}
   end
 
+  it "handles NOTE: when it's the last thing on page" do
+    result = @transformer.transform("h1. foo\n\nHi there.\n\nNOTE: Some note\nmore of *the same* note")
+    result.should == %{<h1>foo</h1>\n<p>Hi there.</p>\n<div class="note"><p>Some note more of <strong>the same</strong> note</p></div>\n\n}
+  end
+
   it "does not convert single line breaks to <br>" do
     @transformer.transform("This\nhas\nbreaks.").should == "<p>This has breaks.</p>\n"
     @transformer.transform("This\nhas\nbreaks.\n\nAnd\nparagraphs.").should == "<p>This has breaks.</p>\n<p>And paragraphs.</p>\n"