Changed Nancy assembly loading

Will not load all assemblies that references a Nancy assembly, instread
of assemblies that follow the Nancy*.dll naming convention.
Tweaked scanning code
Removed explicit call to nancy assembly scanning
Razor engine references all Nancy assemblies

Will automatically include all assemblies that are returned by
AppDomainAssemblyTypeScanner.Assemblies so you do not have to
explicitly add these to the config or an IRazorConfiguration.
Removed assembly import from web.config
Removed unused using statement
Updated variable name and comment
Merge pull request #1001 from thecodejunkie/sdhpimprovements

Various SDHP improvements