Implement ReturnValue() for each plugin.

framework/src/com/phonegap/CameraLauncher.java

@@ -88,6 +88,16 @@ public class CameraLauncher implements Plugin {
 		}
 	}
 
+	/**
+	 * Identifies if action to be executed returns a value.
+	 * 
+	 * @param action	The action to execute
+	 * @return			T=returns value
+	 */
+	public boolean hasReturnValue(String action) {
+		return false;
+	}
+
 	/**
      * Called when the system is about to start resuming a previous activity. 
      */