Allow Strided@2?

[mcabbott]

I haven't tried to use this package, but it is loaded by MLDataSets, and loads Strided.jl at v1, which holds back other things. Can it allow Strided v2?

Locally tests fail, so I did not try out the change:

[ Info: protocal 4
[ Info: Test NP
load: Error During Test at /Users/me/.julia/packages/Pickle/hQSk8/test/test_np.jl:16
  Test threw exception
  Expression: jlscalars[1] == tryparse(UInt32, pyconvert(Any, (npscalars[1]).__repr__()))
  type UInt32 has no field __repr__

Xref Jutho/Strided.jl#25 maybe.