Added unread mail count to tmux pane

Unread mail count comes from an AppleScript that asks Mail.app

bin/spotify.scpt

@@ -0,0 +1,12 @@
+if application "Spotify" is running then
+  tell application "Spotify"
+    set theName to name of the current track
+    set theArtist to artist of the current track
+    set theAlbum to album of the current track
+    set theUrl to spotify url of the current track
+    try
+      return "♫  " & theName & " - " & theArtist
+    on error err
+    end try
+  end tell
+end if