New framework: .NET HttpListener

Based on @pdonald's aspnet work, this eliminates the overhead of IIS and ASP.NET by using the .NET Framework [HttpListener class](http://msdn.microsoft.com/en-us/library/system.net.httplistener.aspx) which is a wrapper around [HTTP.SYS](http://www.iis.net/learn/get-started/introduction-to-iis/introduction-to-iis-architecture#Hypertext), the kernel-mode HTTP driver that is used by IIS. For HTML templates, use Razor with the template parsed at design-time by [Razor Generator](http://razorgenerator.codeplex.com/).

On my system, this gives Go a run for its money for the `json` and `plaintext` tests. The other tests are primarily constrained by database server or driver performance.