zip not commutative if argument sizes do not match

[excessivelyrigorous]

Example 1:

Lazy([0]).zip([]) == [ 0, undefined ]
Lazy([]).zip([0]) == []

Example 2:

Lazy(['a','b']).zip([0]) == [ [ 'a', 0 ], [ 'b', undefined ] ]
Lazy([0]).zip(['a','b']) == [ [ 0, 'a' ] ]

Lodash displays commutativity in these cases.

See #196 for a similar issue.

[Dan Tao]

Gotcha. I'll knock this out after lunch.