[Bug] Codeblock in _second_ line

[Milian Wolff]

Take the following input and both `Markdown.pl` and PHP Markdown will fail:

~~~Input~~~~~~

    Codeblock
~~~End~~~~~~~

~~~Expected~~~~
<pre><code>
Codeblock</pre></code>
~~~End~~~~~~~

~~~Actual Result~~
<p>Codeblock</p>
~~~End~~~~~~~~

There is already a testcase in MDTest for codeblocks in the first line, though 
the above is still not handled properly!
-- 
Milian Wolff
http://milianw.de
OpenPGP key: CD1D1393
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