Adding amd64 support

Moves Libuv.dll into nupkg
Uses ILibraryManager to locate location for native libraries
Updates version numbers to 1.0.0-*
Throws exceptions with error text provided by libuv.dll
Bind to ip4 or ip6 endpoints
Getting server defaults from ini
Enabling "Kestrel" to be used as a Main entrypoint
Adding native dlls in custom build step