Fix .NET 3.5 builds
Merge pull request #229 from kroimon/fix_net35

Fix .NET 3.5 builds
Update AUTHORS
Update CONTRIBUTORS
fix XamlExporter does not write background color
WPF PlotView use correct color for exporters
remove duplicate code in XpsExporter
Merge pull request #233 from tibel/XamlExporter_Background

fix XamlExporter does not write background color
Merge pull request #234 from tibel/PngExporter_Background

WPF PlotView use correct color for exporters
Merge pull request #235 from tibel/XpsExporter_DuplicateCode

remove duplicate code in XpsExporter
fix issue  #225
remove OxyPlot.Metro (#84)
add BasicSample
workaround design time exception
Merge pull request #241 from tibel/remove_metro

Remove OxyPlot.Metro as it is superseded by OxyPlot.WindowsUniversal
rename SilverlightRenderContext to CanvasRenderContext
align Silverlight and WP8 source
remove RenderingControl in WPF
rename ShapesRenderContext to CanvasRenderContext in WPF
Merge pull request #240 from tibel/metro

fix issue  #225