Setting the default timezone in AppVeyor build worker (and C# 7.0 support)

So yesterday I pushed some code over to GitHub, then went off to work on a different project. A few seconds later I got an email from AppVeyor telling me that my CI build worker was reporting a failure. I was surprised as just ahead of the push I had tests all green in local. Turned out failure was on an equality assertion between two date values: As you can see the mismatch was precisely two hours. »