[swell-foop] Do not create new fundamental types

[Michael Catanzaro <mcatanzaro src gnome org>]

commit c1e3abb3db6c5a5dfcdf531a507c9073f6bee358
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Tue Jun 24 08:53:58 2014 -0500

    Do not create new fundamental types

 src/game-view.vala |    2 +-
 src/game.vala      |    2 +-
 src/history.vala   |    4 ++--
 3 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/src/game-view.vala b/src/game-view.vala
index 01b6f76..53c3053 100644
--- a/src/game-view.vala
+++ b/src/game-view.vala
@@ -310,7 +310,7 @@ public class GameView : Clutter.Group
  *  This class holds the textures for a specific theme. These textures are used for creating light
  *  actors and cursor actor.
  */
-public class Theme
+public class Theme : Object
 {
     public Clutter.Image[] textures;
     public Clutter.Image cursor;
diff --git a/src/game.vala b/src/game.vala
index c9e287e..434a6e5 100644
--- a/src/game.vala
+++ b/src/game.vala
@@ -11,7 +11,7 @@
 /**
  *  This is the model layer of a tile.
  */
-public class Tile
+public class Tile : Object
 {
     /* Property */
     private bool _closed = false;
diff --git a/src/history.vala b/src/history.vala
index d892999..3c5c787 100644
--- a/src/history.vala
+++ b/src/history.vala
@@ -8,7 +8,7 @@
  * license.
  */
 
-public class History
+public class History : Object
 {
     public string filename;
     public List<HistoryEntry> entries;
@@ -99,7 +99,7 @@ public class History
     }
 }
 
-public class HistoryEntry
+public class HistoryEntry : Object
 {
     public DateTime date;
     public uint width;