Added BoxPlot wrapper for WPF

Made BoxPlotItem Outliers non mandatory

-) Set outliers default value to null
-) Check if outliers are null before adding them to the values

Added ItemsSource support to BoxPlotSeries

Borrowed some code from BarSeries to get this to work

Fixed Stylecop Stuff

Added BoxPlot WPF Wrapper

Changed default handling for Outliers

-) Outliers should get an empty list instead of null as default as it
can make problems later on if not

Modified Contributors and Changelog

CHANGELOG.md

@@ -11,6 +11,7 @@ All notable changes to this project will be documented in this file.
 - iOS PlotView ZoomThreshold/AllowPinchPastZero for use with KeepAspectRatioWhenPinching=false (#359)
 - CandleStickAndVolumeSeries and VolumeSeries (#377)
 - Axis.DesiredSize property (#383)
+- Added WPF Wrapper for BoxPlot (#434)
 
 ### Changed
 - Changed the OxyPlot.Xamarin.Forms to require the OxyPlot.Mobile dependency instead of each separate NuGet. (#362)

CONTRIBUTORS

@@ -63,6 +63,7 @@ Piotr Warzocha <pw@piootr.pl>
 Senen Fernandez <senenf@gmail.com>
 Shun-ichi Goto <shunichi.goto@gmail.com>
 Stefan Rado <oxyplot@sradonia.net>
+stefan-schweiger
 Taldoras <taldoras@googlemail.com>
 thepretender	
 tephyrnex