YB.ORM-0.2.3 released

Added a simple logger implementation.
Reimplemented xml Writer classes from scratch (no need to use libxml2).
Replaced Xml::Node with more convenient class ElementTree::Element,
still depending on libxml2, but not exposing any of its internals.
Auth is a separate demo project contributed by Nikita Buyvich,
the demo is a minimal HTTP server, which implements a toy auth
ptotocol using XML. Look in examples/auth.
Many bugfixes.
As always, the prebuilt version for MSVC2010 is available.