Convert traits from IDictionary<string, string> to IMultiValueDictionary<string, string>
Rename XunitDiscovererAttribute to TestCaseDiscovererAttribute.
Extracted out common XmlTestExecutionVisitor class from MSBuildVisitor.
Added XunitProject and friends to runner utility.
Update XunitProject to new format (and make Output a project-level setting, not an assembly-level setting).
Order MSBuild results by assembly name.
Initial swag at getting the console runner to work.