Merge pull request #99 from nZEDb/dev

Improve music.
Merge pull request #100 from nZEDb/dev

Forgot to remove old functions.
Merge pull request #101 from nZEDb/dev

Improve music categorizing.
Merge pull request #102 from nZEDb/dev

Add brackets.
Categorization of audiobooks.
Merge branch 'dev' of https://github.com/nZEDb/nZEDb into dev