Add min operation

[sea1jxr]

Just a copy of max with the greater than switched to less than.

One interesting difference the tests pointed out is that max kind of works with nulls

expext(genSequence([null, 1, null, 2]).max()).to.equal(2)

where the min doesn't because null is compared a lot like zero.

expext(genSequence([null, 1, null, 2]).min()).to.be.null

I think that is fine because we were saying that users should filter out items they don't want included in the operation.

[coveralls]

Coverage increased (+0.03%) to 99.776% when pulling 0ac0dad on sea1jxr:min into 438a3ae on Jason3S:master.

[coveralls]

Coverage increased (+0.03%) to 99.776% when pulling 0ac0dad on sea1jxr:min into 438a3ae on Jason3S:master.

[Jason3S]

Thank you.