Release Name: 0.6.1

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:
=== 0.6.1 / 2010-01-04

* Changed the hard-dependency on the 'structured_warnings' RubyGem to a soft-dependency - which lets Rubytree still
  work if this RubyGem is not available.  The rationale for this is that we should not require the user to install a
  separate library just for one single edge-case function (in this case, to indicate a deprecated method).  However, if
  the library _is_ available on the user's system, then it will get used.