Support for < 0 for any.integer about any

[travi]

thats certainly fair. i've just never run into a case in my tests where negative integers would be useful, so i captured my common use-case by using natural instead.

i think i would want to maintain the default behavior of using non-negative values, but switching to chance.integer() and setting a default min of 0 (or 1 might actually be better) would probably enable both.

interested in sending a PR?

[trevtrich]

I sure can. Might be a few days.

[travi]

since this is now implemented using integer from chance (was it not when we opened this?) it accepts any options available to integer. i think i still like defaulting to a min of 1, but it is simple to override the min with a lower value.