Move GifDecoder related classes into third_party.
diff --git a/pom.xml b/pom.xml
index 5f08640..5789f42 100644
--- a/pom.xml
+++ b/pom.xml
@@ -17,6 +17,7 @@
   
   <modules>
     <module>library</module>
+    <module>third_party</module>
     <module>samples</module>
   </modules>