MarkdownSharp - With Github style code blocks

The original MarkdownSharp can be found on google code here https://code.google.com/p/markdownsharp/

This is basically a fork of that, that has been slightly modified to support github style code blocks.

If you're unfamiliar with MarkdownSharp, it's a markdown parser, which was ported from the original perl markdown parser. I believe it is what StackOverflow uses.

My light modifications allow this

```cs
public void Main()
{
  Console.WriteLine("Github Style Code blocks");
}
```

Which will be transformed to the following html

<pre><code class='language-cs'>
public void Main()
{
  Console.WriteLine("Github Style Code blocks");
}
</code></pre>

Then you can use a library like HighlightJS to sytnax highlight that code block, and since we added the class language-cs, it will be highlighted as c# code.

Whatever is after the 3 ticks will be put in the class name

so

```mylanguage

would transform to

<pre><code class='language-mylanguage'>

If anyone wants to add any of the other Github flavored stuff, feel free to pull request. Or, fix my mediocre implementation of the the Github Flavored Codeblocks