swift234

[demo] Add an Objective-C version of our uniq(1) for comparison purposes.

 - Ugh.
 - Swift is 390 characters vs 1024 for Objective-C.
 - Can't compare performance until we have a non-broken Dictionary and sort
   implementation, but Swift version should blow Obj-C out of the water.

Also, sink Swift uniq implementations into a function.

Swift SVN r2469