fix opml export not showing head and title

src/main/java/com/commafeed/backend/rome/OPML11Generator.java

@@ -0,0 +1,19 @@
+package com.commafeed.backend.rome;
+
+import org.jdom.Element;
+
+import com.sun.syndication.feed.opml.Opml;
+
+public class OPML11Generator extends
+		com.sun.syndication.io.impl.OPML10Generator {
+
+	public OPML11Generator() {
+		super("opml_1.1");
+	}
+
+	protected Element generateHead(Opml opml) {
+		Element head = new Element("head");
+		addNotNullSimpleElement(head, "title", opml.getTitle());
+		return head;
+	}
+}