Improve music playlist rendering.

This change:
* bolds currently playing song in playlist;
* forces song names in playlist to one line, ellipsize after (...);
* adds jQuery tipsies to get the whole song name, along with the
  artist name, and the album the song is coming from.

No need to split this changeset into three different ones for the sake
of atomicity.

Two first elements were on the priorities / bug list available there:
   http://gitorious.org/owncloud/pages/Home

apps/media/css/music.css

@@ -22,11 +22,11 @@ div.jp-volume-bar-value { background:#ccc; width:0; height:0.4em; }
 #collection li.album,#collection li.song { margin-left:3em; }
 #leftcontent img.remove { display:none; float:right; cursor:pointer; }
 #leftcontent li:hover img.remove { display:inline; }
-#leftcontent li {white-space: normal; }
+#leftcontent li div.label { float: left; width: 200px; overflow: hidden; text-overflow: ellipsis; }
 #collection li button { float:right; }
 #collection li,#playlist li { list-style-type:none; }
 .template { display:none; }
-.collection_playing { background:#eee; }
+.collection_playing { background:#eee; font-weight: bold; }
 
 #collection li { padding-right:10px; }
 #searchresults input.play, #searchresults input.add { float:left; height:1em; width:1em; }

apps/media/js/playlist.js

@@ -1,11 +1,23 @@
 PlayList.render=function(){
 	$('#playlist').show();
+
+	/*
+	 * We should not empty() PlayList.parent() but thorougly manage its
+	 * elements instead because some code might be attached to those.
+	 * JQuery tipsies are one of them. The following line make sure they
+	 * are all removed before we delete the associated <li/>.
+	 */
+	$(".tipsy").remove();
+
 	PlayList.parent.empty();
 	for(var i=0;i<PlayList.items.length;i++){
 		var item=PlayList.items[i];
 		var li=$('<li/>');
-		li.append(item.name);
-                li.attr('class', 'jp-playlist-' + i);
+		li.attr('class', 'jp-playlist-' + i);
+		li.attr('title', item.artist + ' - ' + item.name + '<br/>(' + item.album + ')');
+		var div = $('<div class="label">' + item.name + '</div>');
+		li.append(div);
+		$('.jp-playlist-' + i).tipsy({gravity:'w', fade:true, live:true, html:true});
 		var img=$('<img class="remove svg action" src="'+OC.imagePath('core','actions/delete')+'"/>');
 		img.click(function(event){
 			event.stopPropagation();