Add scatological word list, addScatologicalWords method and tests

[iabw]

This gives the option of blacklisting a bunch of scatological words at once, but doesn't add them by default. The "addScatologicalWords" method was added to js, python, and php and "add_scatological_words" to the ruby. Unit tests were added for all languages.

I don't personally care about scatological words either, but when building a tool targeted to children this option might be wanted without having to manually build a list oneself. I couldn't find a nice list online somewhere already (which is why I think this PR is useful), so I just combed through http://www.noswearing.com/dictionary and added the words that weren't already in badwords.json

[hugovk]

One option would be to take one of the list of "bad words" linked here and feed them into wordfilter.

Perhaps a more general solution would be to add a function to wordfilter similar to addWords called something like addWordsFromFile, but instead of a list of words, you give it the name of a file containing words (one per line) and it'll open it and add all those words.

[iabw]

That sounds like a good suggestion, although I still think there should be an even more simple way of 'filter as much as possible' - which is what I was reaching for here. I'm sure the lists you link to are better than the list I threw together.

If that's not a goal of wordfilter and there's a more full-featured filter lib, I wouldn't mind a reference to it.