SortDescriptors

I've ported NSSortDescriptor to Pharo.  It works well with SortedCollection and has more features.

Gofer new
        squeaksource: 'DaliotsPlayground';
        package: 'ConfigurationOfDaliotsPlayground';
        load.

(Smalltalk at: #ConfigurationOfDaliotsPlayground) project lastVersion load: 'SortDescriptors'.


Take a look the class comment and unittests.

HwaJong Oh