Change Test Framework about potato

[phogue]

Remove http://teamcity.codebetter.com. I'd prefer not to get emails from it anyway. I can tell when the project I'm working on isn't working, when it's not working.

[m4cx]

What do you mean? You don't want to use a build server? Or do you have another build server instance I don't know?

[MorpheusXAUT]

We currently don't use build servers, but mainly just build the project independently when needed.
Releases are also compiled manually before being distributed.

[m4cx]

Ok, but we should think about using them. This can avoid "works on my machine" problems. So I think we should swith to another unit-testing framework, that is not that tightly coupled with Visual Studio like MSTest is. I also thought about xUnit.NET.

[phogue]

Closing after merge. See #9