Cannot write LinSpace

[mwil]

In Julia v0.5 the output type of the linspace() function has been changed to LinSpace, which is not a subtype of Array, but of AbstractArray. Because of this, it is not seamlessly possible to write the output of linspace() and similar functions.

> NPZ.npzwritearray("test.npz", linspace(1,2))
ERROR: MethodError: no method matching npzwritearray(::String, ::LinSpace{Float64})

It works when you explicitly convert it to Array, but wouldn't it be better to change the signature of npzwritearray() to accept AbstractArray?

[fhs]

I think this has been fixed by 0bd3fbf