Extended SharpCompress.Common.ExtractionOptions with a delegate to write symbolic links. If not is null, and a symbolic link is encountered, an exception is thrown.
Removed Mono.Posix.NETStandard from the library, but added to the .NET Core 2.1 test application.
Extended the test to implement the delegate.
* Add netstandard 2.0 target and netcoreapp2.0 tests
* Update xunit
* set tests explicitly to netcore2
* update travis
* Don't say build as netcoreapp1.0
* try adding dotnet 1 too
* Remove .NET Core 1 support
* switch to circle
* update cake
* fix circle build
* try fix file ending test again
* Fix casing on files
* Another casing fix
* Add back netstandard1.0
* Finish adding netstandard 1.0 back
* Add netstandard1.3 back
* First pass. Writing isn't implemented on stream. Tests are busted.
* LZipReader works...no file name :(
* LZipWriter works
* Writing tests are actually correct now. LZipStream correctly writes trailer now. lzip command line tool likes it.
* Add recommendation blurb
* Update notes for formats
* LZip isn't an archive format
* Attempting to fix and implement crc32
* LZip writing test passes
* Had to invert crc to check uncompressed data.
