Fix for ListView Crash with Segmentaion Fault 11, Release _headerViewProxy observer #5781
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I noticed that _headerViewProxy observer never gets set back to nil that causes crashing my app with segmentation fault 11
objc_msgSend + 6
-TiViewProxy relayout
-TiViewProxy refreshView:
-TiViewProxy layoutChildrenIfNeeded
+TiLayoutQueue layoutProxy:
performLayoutRefresh (TiLayoutQueue.m:46)
....
Possibley related to http://developer.appcelerator.com/question/174242/ios-crashing-when-using-native-back-button and
https://jira.appcelerator.org/browse/TC-4136