Added authentication to the controllers.
Holy Moley, it works.  Can now input ID3 tags.  Very rough, needs cleanup, but it works!
Holy Moley, it works!  Can now add ID3 tag data to database.  Very rough, needs cleanup, but it works!
Cleaned up the 'Add Song From Tag' feature on Songs index page.
DRYed out the error trapping in the Songs controller.
Merge branch 'add_mp3_gem'