* Begin fixing of "Load More" on Home Timeline (IOS-266)
* Don't show "Load More" if last status is first existing (IOS-266)
* Insert missing items upon "Load More" (IOS-266)
* Implement sinceID usage when loading latest posts (IOS-266)
* Change updating of items on Load More(IOS-266)
* Do not try to modify datasource directly (IOS-266)
* Improve load more (IOS-266)
* Fix load more using maxID and limit to 20 items (IOS-266)
* Implement loading missing status in public timeline (IOS-266)
* Implement subsequent "Load More" (IOS-266)
* Make loadMore(item:at:) API more Swifty (IOS-266)
* Address PR comments (IOS-266)
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