dumb_sort

[zbraniecki]

This issue popped up in context of zbraniecki/unic-locale#49

SmallVec is often used when the common scenario is a very limited number of elements. In such cases pulling in the whole complex sort mechanism is an overkill, so having some sort of dumb_sort which is cheap and can reasonably well handle 1-4 elements, would fit into smallvec.

[Manishearth]

This should likely be selection or bubble sort

[mbrubeck]

This might be best as a separate crate so it could be used with ArrayVec as well (and any other slice type).