Renamed FixtureTests to ClassFixtureTests and added CollectionFixtureExample
Change ITestFramework.GetExecutor() to take an AssemblyName instead of an assembly file name.

This will help make it possible for test frameworks to be implemented in portable libraries or on platforms that don't support loading assemblies by filename.
Remove 1574 warnings by using appropriate type references in XML doc comments.
Fixes #5: Exception parsing is REALLY difficult.
#9726: MSBuild runner output should reference source file, not project file
Remove support for project files.
More cleanup of 1574 warnings.
Make ITestFramework an official extensibility point (via TestFrameworkAttribute).
Can't pass interfaces across AppDomains to constructors (yay, how exciting).