Support for .NET Standard 2.0

This release included .net standard 2.0 support. There are nothing special about it, but for correct dependencies it should exists.
Also, in this release two methods were added ComputeAndWriteToEnd/IsValidWithCrcAtEnd to utilize Crc property about calculating crc(data + crc_value). See documentation page for details.

Crc32C support and speed improvements

Additional improvements in algorithm with +70MB/s calculation speed as result.
Added Crc32C implementation (due lack of other .NET core implementations).
Added option to constructor with ability to specify BigEndian/LittleEndian byte conversion for HashFinal.

.NET Core version has been changed from 1.6 to 1.3

v1.0.2

Added support for .NET Core

v1.0.1

Initial Release

Initial release of Crc32. It seems, it would be last release, because implementation is fully completed. But if I find some ways to improve speed, I'll add additional release.