Execute my test project in-proc

gistfile1.cs

            var myProject = new ProjectInstance(@"..\..\my.proj");
            var logger = new HighImportanceStringLogger();
            var success = myProject.Build(new[] { logger });
            Assert.IsTrue(success);

            const string expected = @"Inputs:
  Foo = hi
";
            Assert.AreEqual(expected, logger.ToString());