Fix for #237: Following getting started doesn't find tests when sln is in project directory
Fixes #226: Improve fixture disposal error handling
Add links to project.json files for ASP.NET projects
Add configuration file support for 'xunit.preEnumerateTheories'
Replace XunitDiscoveryOptions and XunitExecutionOptions with interfaces and extension methods
Fixes #221: Add configuration element to disable pre-enumeration of [Theory] data