Release Name: 0.6.0

Notes:



Changes:
* Added convenience method user_frame_text to Tag for finding a
  TXXX frame given a description (e.g. "MusicBrainz Album Id")
  (RubyForge feature request 24381)
* Fixed compilation problem on Ruby 1.9 (GitHub issue 1)
* Don't check for ID3Tag_New in extconf.rb (RubyForge bug 27589)
* Updated to SWIG 1.3.40
* Use rake-compiler for cross-compiling the extension