Clean up of logging messages as described here

All logging now prefers the ' (single quote) over the " (double quote)

https://github.com/sampsyo/beets/wiki/Hacking
Merge branch 'master' of https://github.com/sampsyo/beets
flake8 cleanup

Cleanup after cleanup
Fix Travis errors

I was over zealous on the brackets for formatting
Oh the formatting
Just go back to basics
displayable_path clean up error
Update genres-tree.yaml

Scraped https://en.wikipedia.org/wiki/List_of_popular_music_genres for the first time since @KraYmer did back in (apparently) October 2011. This should be much more useful now to those who have genre canonicalization enabled. Script is in public repo of mine :)
Remove stray print statements

Left by @geigerzaehler in 4835475f.
Remove scripts from lyrics
Merge pull request #927 from Bombardment/master

Remove scripts from lyrics
Changelog for #927
Alphabetize! Thanks @KraYmer
Display correct number of albums to play

This fixes a bug where the output of beet play for a single album would be: "Playing 12 album."
added an option to make the playlists created by play plugin to be
relative to a path much like the smart playlist plugin
updated documentation for play plugin adding relative_to option info
Merge pull request #931 from BrainDamage/playrelative

play plugin can generate relative paths
Changelog for #931
info: Show data for each item, not only first one
Update genres-tree.yaml