0.1: May 12 2009
   * initial release

0.2: November 23 2009
   * updated libyaml to version 0.1.3
   * now properly dumps and loads strings containing binary data using base64
   * dumped strings are quoted when they could be loaded as numbers
   * nulls are loaded as yaml.null, a function that returns itself and can
     be used to test for equality
   * load now also recognizes 'yes' as a boolean truth value
   * zero length scalars are not converted to nil
