Fix Actions.elements does not emit values

[Econa77]

Fixed #216

I encountered a case similar to the issue ( #216 ) and committed testing and a temporary fix. It seems that the values does not emit if the timing to subscribe the elements is after the input.

I don't think this fix is so good, so does anyone have any other ideas?

[rxswiftcommunity]

	Warnings
⚠️	It looks like code was changed without adding anything to the Changelog. If this is a trivial PR that doesn't need a changelog, add #trivial to the PR title or body.

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[ashfurrow]

It's been a while since I used RxSwift day-to-day... is this a bad solution just because of the .share()? We can definitely find someone closer to the code than me to review this 👍

[Econa77]

@ashfurrow I think the bad solution is an empty subscribe to keep the values emitting.

elements
    .subscribe()
    .disposed(by: disposeBag)

This is necessary to subscribe to the values at any time, but it difficult to understand why this empty subscribe is needed on code.

[RobertDresler]

Any update?