Instead of a specific Silverlight version, we now provide a separate
Portable Library assebly that supports .Net 4.0.1 and higher,
Silverlight 5 ad well as .Net for Metro style apps (WinRT).
New NuGet Package MathNet.Numerics.Portable with the portable library.
Since MathNet.Numerics.Portable now supports silverlight, the normal
package MathNet.Numerics no longer supports it (.Net 4 only).
Reworked the common parallel execution infrastructure for more reasonable
abstractions and better compatibility with portable libraries. Portable
libraries do support parts of the TPL, but neither the Parallel class nor
straight threading.