Add Docs spellchecking Test.

Not sure this is the best way to go, but it works. I'm not crazy about
running the spellcheck against the built docs, but aspell has a builtin
option to easily ignore everything in `<code>` tags which greatly simplfies
things.

I looked at Doug Hellmans' sphinxcontrib-spelling package which does
something similar for Sphinx. However, as Sphinx uses rST and the rST
parser outputs a parse tree, Doug is essentially taking that parse tree
and running the spellcheck on the appropriate parts (skipping code, etc.).
He did a nice [writeup][5] of his development process if you are interested.

As Python-Markdown's parse tree is represented as HTML (through ElementTree)
I would have to use HTML anyway. And [PyEnchant][2] doesn't currently have
good support for HTML. So I used [aspell][3], with inspiration from the
[git-spell-check][4] hook.

[1]: http://sphinxcontrib-spelling.readthedocs.org/en/latest/index.html
[2]: https://pythonhosted.org/pyenchant/
[3]: http://aspell.net/
[4]: https://github.com/mprpic/git-spell-check
[5]: http://doughellmann.com/2011/05/26/creating-a-spelling-checker-for-restructuredtext-documents.html

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