`lazyperm` function for making permutations lazy

[AntonOresten]

function lazyperm(x::AbstractArray{<:Any,N}) where N
	return PermutedDimsArray(x, ntuple(identity, N))
end

With Rewrap.jl, reshapes should keep the PermutedDimsArray wrapper, and permutes should just change the permutation.

[AntonOresten]

Perhaps trailing reshapes could copy when needed to avoid a double wrapper. Related to #33.

Or a contiguous function that works on nested wrappers.