rubytree version 0.5.3 has been released!

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:

### 0.5.3 / 2009-12-31

* Cleanup of the build system to exclusively use Hoe.
* Modifications and reformatting to the documentation.
* No user visible changes.