Merge pull request #22 from XForms/master

Merge with Main
Merge pull request #23 from XForms/master

Merge from main
Merge pull request #24 from XForms/master

Merge from main
Android ExtendedScrollView
Merge pull request #252 from jguertl/master

Android ExtendedScrollView
Numerous fixes for WP Charting
Included new screenshot for correct WP chart
screenshot
Merge remote-tracking branch 'upstream/master'
Merge pull request #254 from Snorvisable/master

Numerous fixes for WP Charting
Added ExtendedScrollView Screenshots
Added ExtendedEntry
Merge pull request #257 from jimbobbennett/ExtendedEntry

Added ExtendedEntry
Merge pull request #256 from jguertl/master

ExtendedScrollView Screenshots
Calculate col size & no of cols. Fire OnElementChanged on orientationchanges
Possible fix #255
Merge remote-tracking branch 'upstream/master'
Merge pull request #260 from Snorvisable/master

Calculation of number of columns and adjust on orientationchanges.
Added Popup support for top/bottom

Tested on WP8. Will add left/right later.
Changed JSON serializer for Android

https://github.com/XForms/Xamarin-Forms-Labs/issues/255#issuecomment-536
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