rbtree implementation

Author: JaapWijnen

Red-Black Tree 2/RBTree.swift

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+# Red-Black Tree
+
+Used info from
+
+https://en.wikipedia.org/wiki/Red–black_tree
+http://www.geeksforgeeks.org/red-black-tree-set-1-introduction-2/
+http://www.geeksforgeeks.org/red-black-tree-set-2-insert/
+http://www.geeksforgeeks.org/red-black-tree-set-3-delete-2/
+
+Important to note is that the last one doesn't mention a few important details about deletion cases which can be found in the code itself.

Red-Black Tree 2/README.markdown

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+//: Playground - noun: a place where people can play
+
+let array = [6,78,89,4]
+var tree = RBTree<Int>(withArray: array)
+tree.insert(5)
+tree.insert(8)
+tree.insert(2)
+tree.delete(6)
+tree.delete(8)