Commented Issue: Make Portable Libraries [259]

For v2 we need to refactor to portable libraries.
Comments: There is a C# compiler bug with referencing PCL assemblies that might also harm us here: [VS2012 incorrectly resolves mscorlib version when referencing PCL assembly](https://connect.microsoft.com/VisualStudio/feedback/details/779370/vs2012-incorrectly-resolves-mscorlib-version-when-referencing-pcl-assembly) This bug let the WPF designer in VS2012 crash, see [OxyPlot discussion](https://oxyplot.codeplex.com/discussions/431821) for details.