Please add arithmetics functions min and max

[Garagoth]

Plaese consider adding min() and max() functions to arithmetic functions.
Currently to get mininum value of two variables I am using:
{{ $res := subtract 1 (or (and (gt ($len_loc) $idx) (add 1 $idx)) ($len_loc)) }}
which is... well, not very readable. (subtract and add are to work around $idx being 0 as or sees this as false value. $len_loc is a length of an array).

And this is just for 2 variables... pipelining this would be a nightmare, as opposed to for example:
min $x | min $y | min $i $j

[thevilledev]

Available since #1323 or consul-template v0.25.0