Windows Universal stuff working!
Minor appearance changes.
Fix build issues.
Merge branch 'develop' of https://github.com/Cheesebaron/oxyplot into feature-universal

Conflicts:
	Source/Examples/WindowsUniversal/WindowsUniversal/WindowsUniversal.Shared/UniversalGeneric.xaml
Update WindowsUniversal projects.
Rename example to ExampleBrowser.
Move control templates to OxyPlot.WindowsUniversal
Add projects to OxyPlot.sln and OxyPlot.AppVeyor.sln
Create nuspec
Merge pull request #190 from objorke/feature-windowsuniversal

Windows universal support (include in AppVeyor build and NuGet package)
Fix issue when axis is outside plot area
Merge pull request #192 from objorke/bugfix-positionatzerocrossing

Fix issue when axis is outside plot area (#189)