Add word count cases

[pvcarrera]

Related to exercism/ruby#448

Add four additional test cases:

• Handles cramped lists: Tests that words separated by commas and no spaces are counted.
• Handles expanded lists: Tests that words separated by commas and new lines are counted.
• With apostrophes: Checks that words with apostrophes are also counted as words.
• With quotations: Checks that words with quotations are also counted as words.

[Insti]

@pvcarrera it's useful to give a more complete description of the changes you are proposing here. Not everyone will be familiar with Ruby or the xruby track.

[pvcarrera]

@Insti sure, I've expanded the PR description, do you think is good enough?

[petertseng]

Notes for me: word-count.json was first added in #103 (I am far too lazy to figure out which tracks implemented it at the time, and it was not mentioned in #103 and so I have no insight on any decision to include or not include any cases). only update since then was #128 . Another thing I'll not have time to do is go to every track that implements word-count (and there are a lot of them) and see whether they have these cases.

So all I can say is what I think from looking at the cases: The new test cases do indeed test new things, and I think they are interesting. I support their addition.

[kytrinyx]

This looks great, thank you!

Maybe we can/should submit an issue to the various tracks that implement it and have each track check individually (using http://github.com/exercism/blazon). Actually, I might sit down and look through which new canonical-data.json files we've gotten that we haven't submitted issues for across the tracks, and script that up with good-first-patch labels.