Add unit test for $] comparison

[atoomic]

Add test to cover the discussion from RT 134273 https://rt.perl.org/Ticket/Display.html?id=134273

also view patch/discussion from #128

[khwilliamson]

I added some functions to generate version numbers into a file that could be made available to all .t's. It is similar to the macro the previous maintainers implemented so you could get unambiguous version numbers in C space, but this works from perl space. I'm thinking we should convert all uses of $] to be operated on by this function so that we can get integer versions, and then change the comparators to integers as well

[atoomic]

This is a good idea, we can use this issue to track these changes, and replace all usages of $] with this new helper