Remove :au_tas test for the time being

[ppeble]

Hey @ghiculescu and @adamlyons2. Unfortunately I have more bad news here. What I've discovered is that everything is working as intended, except...for this in the ruby repo: https://github.com/holidays/holidays/blob/master/lib/holidays/finder/rules/in_region.rb#L9-L21

Basically, when we determine whether a specific date is 'in a region' we also currently check its parent region. By adding back in :au we are telling :au_tas to also grab any :au holidays, which means it ALSO picks up the NYD from 1/1. This isn't what you wanted but...I don't see an easy fix for the moment.

The problem is that there are a lot of other tests/features that rely on this functionality. But you want to be able to say :au_tas and have it NOT pick up any :au holidays. I think this is a new feature (which is totally fine) but I was hoping you could provide some feedback. What if we added a new flag to the ruby gem to 'ignore parent regions' if specified? For example, you could call:

Holidays.on(Date.civil(2017, 1, 1), :au_tas, :exact)

And it would only pull back exact matches for the region specified, not doing any expansion.

I don't know if :exact is a good name or what. But I think it makes sense that 'sub regions' pick up their parents by default...that makes the most sense to me. So adding in a flag to disable that might be the best option.

I know I'm going back and forth on this and I apologize. Last three months have been a blur and I haven't really done you right on this front. 😦

Thoughts? I'm gonna merge this in so I can get green builds on the ruby side (since it's been so long) but we can definitely talk about it in the coming days.