add Date optional initialization params

[ptarjan]

Making this match the docs https://ruby-doc.org/stdlib-2.3.1/libdoc/date/rdoc/Date.html#method-c-new

[jeffrey-s-foster]

Any idea why this is failing on travis? It seems obviously correct.

[ptarjan]

@jeffrey-s-foster it is because the Date class is "sort of" in the stdlib but you need to require 'date' to get all of it.

I added a horrible ugly commit to do that...