Change string_elt/vector_elt to accept R_xlen_t

[thirdwing]

As @eddelbuettel suggest, break #556 into some small PRs.

This also makes the Changelog looks better.

[eddelbuettel]

That looks very clean, thumbs up. Will look some more later.

I am having issue with Travis right now -- which appears to be down per https://www.traviscistatus.com/. Might be best to just wait a few hours and then resubmit at Travis.

[kevinushey]

LGTM as well! (Travis is probably down due to http://gizmodo.com/this-is-probably-why-half-the-internet-shut-down-today-1788062835)

[eddelbuettel]

Restarted, and passed as expecting. So ... merging.

[hrbrmstr]

Aye, that'd be the reason. We've been tracking the outage where I work and
watching the various providers try to compensate. Such a fragile internet
we have.

On Fri, Oct 21, 2016 at 2:32 PM, Kevin Ushey notifications@github.com
wrote:

LGTM as well! (Travis is probably down due to http://gizmodo.com/this-is-
probably-why-half-the-internet-shut-down-today-1788062835)

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