Port to .NET Core

[jarroda]

Started work on .NET Core. Issues so far:

• Transaction support is not in .NET Core 1.0 (No System.Transactions namespace). Support has been implemented https://github.com/dotnet/corefx/issues/2949
  • Solution: use ifdef to disable transaction support (TransactionFilter, TransactionMiddleware)
• BinaryFormatter is not supported in .NET Core 1.0. Support has been added Add BinaryFormatter to corefx dotnet/corefx#10088
  • Solution: use ifdef to disable binary serialization
• Performance Counters are not supported in .NET Core 1.0. Support may be added in the future https://github.com/dotnet/corefx/issues/4577
  • Solution: use ifdef to disable Performance Counter support
• Thread Apartment states and ThreadPriority are not support in .NET Core 1.0
  • Solution: use ifdef to disable these features.
• System.Runtime.Caching is not available in .NET Core