Add .gitignore.
Add files from beets for lyric tagging.
Alter import of enumeration.
Add tag_audio_file().
PEP8 tidying.
Fix print function.
Add generate_output().
Feed tracklisting string directly into lyrics tag.
Tidy up layout of print statements.
Comment out unused lines.
Change != None to is not None.
Tidy up alignment of line.
Add .mp3 to .gitignore.
Add details of branch to README.md
Forgot to return listing_string in generate_output().
Add TODO.
Add get_output_filename().
Update get_output_filename() docstring.
Hook get_output_filename() into code.
Remove unneeded functions.