word-count: Normalization independent testing #253

When @wobh added a test for normalization in #207 @kytrinyx noted the following:

I like that it leaves the choice up to the implementer as to how to do normalization.

Sadly this is only true for that single test case, all other 10 assume lower case normalization.

The best way to fix this would be if Python or some built-in package like unittest would provide us with a case insensitive string comparison function or something like it. I couldn't find one but there has to be something. We can't be the first having this problem.

I wrote a prove of concept but as we can't ship additional modules with the cli and it only works with Python 3 that doesn't do the trick.
https://gist.github.com/behrtam/2894facca0f35f642300