Added playlists on packs pages

[vampirefrog]

Now you can create playlists and add songs to them. It's still work-in-progress, discuss here: http://vgmrips.net/forum/viewtopic.php?f=2&t=1844

As you can see, you can create playlists. If you go to a pack page, you'll notice a new button when you hover over a song, "Add to".

So just create a playlist and use the "Add to" button to add a few songs.

Then you can play the entire playlist, and share the URL.