Create Sequence.Tree.Path
-------------------------

                 Key: PIVOT-84
                 URL: https://issues.apache.org/jira/browse/PIVOT-84
             Project: Pivot
          Issue Type: Improvement
          Components: core-collections, wtk
    Affects Versions: 1.1
            Reporter: Todd Volkert
            Assignee: Todd Volkert
            Priority: Minor
             Fix For: 1.2


Create the following new class:

Sequence {
   Tree {
       public static class Path implements Sequence<Integer>, Iterable<Integer>;
   }
}

The static methods in Sequence.Tree, and pivot.wtk.TreeView can change from 
using raw Sequence<Integer> to using Path.  This is not only more explicit, but 
it allows callers to iterate over the path, whereas Sequence is not iterable.

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