Towards #24 - post build event for libsodium-net

Copy the dll's based on the platform

Towards #24 - post build event for Test proj

Copy the dll's based on the platform

Should check condition on variable $OS not $Platform fixes #24

This includes too small fix to post build it on windows

remove added whitespace on Tests.csproj
Including libsodium-64.dll, copying to output
Merge pull request #27 from fraga/postBuildEvents

Towards #24 - post build event for libsodium-net