Merge pull request #1 from Kernald/master

Fix trailing artist spaces
Updated readme to include beetsconfig

ftInTitle should be added to the plugins line in the beets config , which i forgot to mention.

reason : https://groups.google.com/forum/?fromgroups=#!topic/beets-users/MwE0lBGQevc
spelling error
included support for & characters as featuring artists
tested a new version of beets and modified accordingly.
plugin now works with version :beets version 1.1.0-beta.3
and validated the & sign as featuring artist.
updated README file for latest verion of beets.
Updated the config file locations and added sudo to the setup line.