C# projects are run

[jeroenwalter]

The Google Test Runner looks for projects with the suffix Test or Tests and then runs it. However, I have a solution that has C# tests projects, that also have the Tests suffix. Google test runner now runs those executables as well. It should not do that. It'd be nice if the google test runner can be configured for a solution which projects are unit test projects instead of relying on the executable's filename. Also, it just shouldn't run C# executables.

[vkantchev]

@jeroenwalter Please feel free to fork and fix. Then submit a pull request. It will be promptly merged, packaged and released.