make sure we compare ids converted to string
and use underscore to iterate over the playlists id

Fixes #80

Signed-off-by: Tomas Neme <lacrymology@gmail.com>
use our saved playlist, not what's returned in status

Signed-off-by: Tomas Neme <lacrymology@gmail.com>
return calculation of prevClip and nextClip back to underscore

Signed-off-by: Tomas Neme <lacrymology@gmail.com>