Get version from manifest via Package.getImplementationVersion()
added ID3v2.setGenreDescription(String text), fixes #6
improved tests for ID3v2Tag.setGenreDescription(String)
yet another test for ID3v2Tag.setGenreDescription(String)
Small change to test which is easier to read
Refactoring: replace verbose if/else blocks with ternary operator
Merge branch 'master' of https://github.com/mpatric/mp3agic

# By Christoph Beck (4) and Michael Patricios (2)
# Via Michael Patricios
* 'master' of https://github.com/mpatric/mp3agic:
  Refactoring: replace verbose if/else blocks with ternary operator
  Small change to test which is easier to read
  yet another test for ID3v2Tag.setGenreDescription(String)
  improved tests for ID3v2Tag.setGenreDescription(String)
  added ID3v2.setGenreDescription(String text), fixes #6
  Get version from manifest via Package.getImplementationVersion()

Conflicts:
	src/main/java/com/mpatric/mp3agic/AbstractID3v2Tag.java