Add a default response wrapper for .net implementation layer.

[undiwahn]

We offer an 'inspector' option that allows users to intercept a response from a controller and 'wrap' it in some way. Internally, we use this pretty consistently to provide a 'Response' object containing a boolean 'Success' status, object 'Data' property (on success) and strings for ErrorCode, Message, and Details (on error).

It would be convenient for users who are setting up a brand new API to offer a default implementation that does this, as it has many benefits.

• Create a class 'ApiResponse' with the properties mentioned above
• The Inspector signature used throughout would need to be upgraded to include any thrown exception as well as the result object and the context
• ExpandResultAttribute.OnActionExecuted would need to pull any thrown exception from the ActionExecutedContext and pass it to any inspector lambda.
• Create a method on PopcornConfiguration called 'UseApiResponse'
  • This would attach an inspector that captures the result and wraps it in a new ApiResponse with Success = true if no exception was thrown, or Success = false, ErrorCode = (type name of the exception), Message = (Exception message), Details = (Exception.ToString())

[alexbarbato]

@undiwahn - I'll give this one a go