Change the paths stored on the database

The paths in the database now are relative of the config BOOKS_PATH and COVER_PATH

For updating the database this query should be use:
for (var i = db.books.find(); i.hasNext(); ) {
        var book = i.next();
        db.books.update({_id: book["_id"]}, {$set: {path: book["path"].slice(6), cover: book["cover"].slice(7), coversmall: book["coversmall"].slice(7)}});
}

templates/edit.html

@@ -4,7 +4,7 @@
 <div class="row">
 {{if .Cover}}
 	<div class="span4">
-	<img src="{{.Cover}}" alt="{{.Title}}" class="pull-right" />
+	<img src="/cover/{{.Cover}}" alt="{{.Title}}" class="pull-right" />
 	</div>
 {{end}}