Reference Nustache
View engine and view engine registry stub
Merge branch 'view-engines'

Conflicts:
	src/Dolstagis.Web/Dolstagis.Web.csproj
Reference Nustache in tests.
Reference Newtonsoft.Json
Use StaticFiles property of Module for locations instead of IOC container
Remove IHttpApplication/HttpApplication.

It's just clutter in the request context. We'll use the Application class
instead.
Rename IHttpContext to IRequestContext and move to root namespace.
Move request context to core assembly and pass request and response separately
Rename IHttpRequest and IHttpResponse to IRequest and IResponse
IRequestContextBuilder class.
Move exception handling to request processor, action details to request context
Drill down through outer AggregateExceptions.