fix CI build

[adamralph]

It's been broken for aaaaaaaaaaaaaages....

And makes our scriptcs root node red

[adamralph]

I fixed the build config. It was using a hopelessly outdated version of nuget.exe to do the package restore.

[adamralph]

Correction: #19 also needs to be mreged to close this.

The build has been failing because the solution depends on Common.Logging yet does not declare it as a dependency. #19 removes Common.Logging,