Changelog release info

Version 1.0

First oficial version. The basic features may be working correctly.

Version 2.0

Small changes, including:

• Printer methods made public
• when node has not the attribute present, null gets returned instead of empty string
• XSPFRuntimeException replaces RuntimeException where it used to happen
• added the "find by" methods to some collection types
• examples moved from production sources to tests

Version 2.0.1

Closes #1 (tons of blank spaces beeing generated in the produced xspf file).

Version 3.0

Closes #2 (nullable vs. non-nullable converters).

Version 3.0.1

Created the wiki page (several chapters removed from the project README file)

Version 3.0.2

Removed leftover XSPFLink class.