Add basic arithmetic to Math

[Angus Croll]

Rationale:

Some functional JavaScript
idioms<https://twitter.com/skilldrick/status/211868188806352896>are
hamstrung by the lack of native basic arithmetic functions.
Would be handy/elegant/instructive to be able to write

arr.reduce(Math.add);

Moreover having functional versions of arithmetic operators would improve
the currying/partial/composition experience.

Caveats:

1. Arrow functions work pretty well too:
arr.reduce((a,b)=>a+b);

2. If add and multiply accepted multiple args, reduce would not be
necessary for these cases:
Math.add.apply(null, arr);
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