Release Name: 0.6.0

Notes:
Rubytree is a Ruby implementation of the generic Tree data structure.  It provides a generic tree data-structure with
ability to store keyed node-elements in the tree.  This implementation is node-centric, where the individual nodes on
the tree are the primary objects and form the leafs of the structure.  The implementation mixes in the Enumerable
module.


Changes:
=== 0.6.0 / 2010-01-03

* Fixed the bug#22535[http://rubyforge.org/tracker/index.php?func=detail&aid=22535&group_id=1215&atid=4793] where the
  depth method was actually returning height+1 (not the depth).

* Marked the Tree::TreeNode#depth method as *deprecated* (and introduced the run-time dependency on
  structured-warnings[http://github.com/schmidt/structured_warnings] gem).