Remove debugging print statement from tagger
Change downloader to print out youtube filename after grabbing it from them.
Fix relative filepaths in read

Added a File.join statement so that the script can be run from outside
of its own directory. (It wasn't looking in the right place for the
VERSION file.)
Allow add/download without further arguments.
Add Tagger method to read mp3 tags
Add library functionality

Added a music library store which records each file downloaded to avoid
duplicates
Add scan function to scan existing directory and add songs to library
Update readme with latest interface
Remove pry require statements.
Bump version to 1.1.0