Fixed the issue:
whenObserveChangesOnTheView_thenValueModelShouldReceiveTheChange(org.robobinding.widget.listview.SetCheckedItemPositionsAttributeTest)
Time elapsed: 0.903 sec  <<< FAILURE!
java.lang.AssertionError:
Expected: <[]>
     got: null

	at org.junit.Assert.assertThat(Assert.java:778)
	at org.junit.Assert.assertThat(Assert.java:736)
	at
org.robobinding.widget.listview.SetCheckedItemPositionsAttributeTest.whenObserveChangesOnTheView_thenValueModelShouldReceiveTheChange(SetCheckedItemPositionsAttributeTest.java:44)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
Merge branch 'develop' of https://weicheng113@github.com/RoboBinding/RoboBinding.git into develop