Add loading gif for infinite pagination
Auto scroll to bottom (to ensure user see the loading gif)
Remove auto-scroll

Auto-scroll to bottom causes multiple loads (we are always at the bottom of the page, then it keep loading posts until we reach the end of the feed)
Fix autoscroll issue

Instead of scroll to the bottom of the page, we just scroll 250px down.
This allow user to see he loading gif, but keep the page in place when next posts are loaded.
Merge pull request #275 from zessx/patch-infiniteload

Add loading gif for infinite pagination