fenced code blocks

fenced-code-blocks extra

It allows a code block to not have to be indented by fencing it with '```' on a line before and after. Based on [GFM](<http://github.github.com/github-flavored-markdown/).

Some code:

```
print "hi"
```

It includes support for code syntax highlighting as per GFM. You must have the pygments Python module installed for this to work.

```python
if True:
    print "hi"
```

This obsolets the code-color extra.

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