Added all errors defined by BSD layer of OS X.
* Claunia.IO/Tests/Interop.Apple.cs:
Added tests for Apple's stat() and stat64()
* Claunia.IO/packages.config:
Added NUnit to do tests.
* Claunia.IO/Claunia.IO.csproj:
Added tests
* Claunia.IO/Interop/Apple/Interop.Apple.stat.cs:
Mono calls stat with 32-bit inode, modify structure and add
stat64() call.
* Claunia.IO/Interop/Apple/Interop.Apple.types.cs:
Pack structure, dunno if needed