v0.4.0-rc1

Sconsify 0.4.0-rc1:

• Mark playing song in the track list.
• Search aliases al = album, ar = artist, tr = track:

    al:help
    ar:the beatles
    tr:let it be

• Fix pause to actually pause the track and not to stop it.
• Temporary playlist. Type c in the queue view, type a name and then a temporary playlist will appear containing all songs in the queue view.
• Show tracks as title + artist instead of artist + title.