add "sorted"

[erelsgl]

I want to compare two arrays, A and B, regardless of order.

Currently I have to do this in 3 lines:

A.sort()
B.sort()
A.should.eql(B)

Since this is a common scenario, it could be very useful to do this in 1 line, for example:

A.sorted.should.eql(B.sorted)

... or something like this.

[btd]

I do not think it is common case and that should.js should do everything that can be tested.