added needed fields in models and needed libraries for frontend (#67)

src/main/java/com/commafeed/backend/model/FeedSubscription.java

@@ -33,6 +33,8 @@ public class FeedSubscription extends AbstractModel {
 	@OneToMany(mappedBy = "subscription", cascade = CascadeType.REMOVE)
 	private Set<FeedEntryStatus> statuses;
 
+	private Integer position;
+
 	public Feed getFeed() {
 		return feed;
 	}
@@ -73,4 +75,12 @@ public class FeedSubscription extends AbstractModel {
 		this.statuses = statuses;
 	}
 
+	public Integer getPosition() {
+		return position;
+	}
+
+	public void setPosition(Integer position) {
+		this.position = position;
+	}
+
 }