Added Gitter badge
Add gitter link
Add int overflow example
Merge pull request #211 from gitter-badger/gitter-badge

Add a Gitter chat badge to README.md
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#214: Make TrackerFormatStrings consistent.
Delete ITrackableSeries
Mark TrackerHitResult constructor with parameters obsolete
Add release notes
Move the Smooth property from DataPointSeries to LineSeries
Rename OxyPenLineJoin to LineJoin (breaking change)
Change LineStyle Undefined to Automatic (breaking change)
Support BrokenLineColor = Automatic in LineSeries
#214: Add missing tracker text for LineSeries and AreaSeries
#214: Correct default values for Wpf series
Update release notes
Add support for Xamarin.iOS (Unified API)
Add PlotView for Xamarin.Mac
Rename iOS render context to CoreGraphicsRenderContext
#180: add examples
#12: add LabelFormatString to ScatterSeries