Removing useless using directive.
Fixing packages configuration. Old merge conflict is still in place (facepalm)
Migrating to Package Restore workflow. Starting from NuGet 2.7 packages can be redownloaded from the web. No need to keep the local. Further details about its inner workings can be found here: http://docs.nuget.org/docs/workflows/using-nuget-without-committing-packages and here http://www.codeproject.com/Articles/680678/Keep-Nuget-Packages-Out-of-Source-Control-with-Nug
Removing useless references from SoundTools project. No need to install packages to it as it is completely self manageble.