Zip function for flyd streams
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README.md

Creates a stream with values from any number of source streams lined up with each other. For example if you have two streams with values [1, 2, 3] and [4, 5, 6, 7], the resulting stream will emit [1, 4], [2, 5], and [3, 6]. The resulting stream will emit the next value only when it has at least one value from each source.

const s1 = flyd.stream()
const s2 = flyd.stream()
const zipped = zip([s1, s2])
s1(1)
s2(2)
zipped() // [1, 2]
s2(3)
zipped() // [1, 2] -- s1 still has old value so zipped does not change
s1(4)
zipped() // [4, 3]

Zip is not like lift, because lift will give you a pair for every new value. For example:

const s1 = flyd.stream()
const s2 = flyd.stream()
const lifted = lift((v1, v2) => [v1, v2], s1, s2)

s1(1)
s2(2)
lifted() // [1,2]
s2(3)    // [1,3]