Validates that the type used as a generic argument in WebApplicaitonFactory is contained within the entry point to assembly and throws InvalidOperationException otherwise
If another handler modifies the request headers the modified headers get
applied on subsequent requests, which is not correct. This change copies
the headers before sending the request and uses the original headers for
the redirect request instead of the potentially modified ones.
* Clean up unnecessary workarounds on the build project.
* Remove the need to specify the content root relative to the solution
and use a solution based on an assembly level attribute on the test
assembly created at build time.
* Remove non parameterless constructors.
* Add support for creating specialized factories from the base factory
and keep track of "child" factories for disposal.
* Add support for creating clients that handle cookies and redirects
automatically.