Use interfaces for database managers, create a source manager

app/src/main/java/eu/kanade/mangafeed/util/DummyDataUtil.java

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+package eu.kanade.mangafeed.util;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import eu.kanade.mangafeed.data.models.Chapter;
+import eu.kanade.mangafeed.data.models.Manga;
+
+/**
+ * Created by len on 8/10/15.
+ */
+public class DummyDataUtil {
+
+    public static List<Manga> createDummyManga() {
+        ArrayList<Manga> mangas = new ArrayList<>();
+        mangas.add(createDummyManga("One Piece"));
+        mangas.add(createDummyManga("Berserk"));
+        mangas.add(createDummyManga("Horimiya"));
+        mangas.add(createDummyManga("Übel Blatt"));
+
+        return mangas;
+    }
+
+    private static Manga createDummyManga(String title) {
+        Manga m = new Manga();
+        m.title = title;
+        m.url="http://example.com";
+        m.artist="Eiichiro Oda";
+        m.author="Eiichiro Oda";
+        m.description="...";
+        m.genre="Action, Drama";
+        m.status="Ongoing";
+        m.thumbnail_url="http://example.com/pic.png";
+        return m;
+    }
+
+    public static List<Chapter> createDummyChapters() {
+        List<Chapter> chapters = new ArrayList<>();
+        Chapter c;
+
+        for (int i = 1; i < 50; i++) {
+            c = new Chapter();
+            c.manga_id = 1L;
+            c.name = "Chapter " + i;
+            c.url = "http://example.com/1";
+            chapters.add(c);
+        }
+
+        return chapters;
+    }
+
+}