Class rename refactoring

Author: jyemin

driver/src/test/unit/com/mongodb/DBObjectFactoryTest.java renamed to driver/src/test/unit/com/mongodb/DBCollectionObjectFactoryTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2014 MongoDB, Inc.
+ * Copyright 2008-2015 MongoDB, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -25,7 +25,7 @@
 import static org.hamcrest.CoreMatchers.instanceOf;
 import static org.junit.Assert.assertThat;
 
-public class DBObjectFactoryTest {
+public class DBCollectionObjectFactoryTest {
 
     private DBCollectionObjectFactory factory;