* add missing ref for build in VSO hosted VS 2017 build
* project to just build Dlls
* target multiple frameworks
* switch to net46/netstandard1.3
* fix projects to allow for netcoreapp 2.0 build
* fix networking for .Net Core 2.0:
SendAsync and ReceiveAsync now frequently return synchronously even if successful. These cases had not been properly handled yet, previous versions never hit these codepaths.
* fix travis build / nugets
* change travis build target
* fix Kestrel https option for netstandard 2.0
tested with Ua Expert against standard and ref server
* Handle special case correctly, when zero bytes are received its ok, or BadTimeout will occur
* simplify connect, reduce DiscoverEndpoint calls
* Add visual studio 2017 solution file to allow building .net Standard stack and console samples
* Enable VS 2015 when VS 2017 is installed
* Update readme
Martin Regen