Fix jshint warnings in music/albumgenres.js

- Use single quotes
Fix jshint warnings in music/artistalbum.js

- Use single quotes
Fix jshint warnings in music/genre.js

- Use === and !== comparators
- Use single quotes
Fix jshint warnings in music/images.js

- Add missing ;
- Remove unnecessary ;
- Use === and !== comparators
- Use single quotes
Fix jshint warnings in music/include.js

- Add missing ;
- Remove unnecessary ;
- Use === and !== comparators
- Use single quotes
- Declare variables before they're used