New Response Serialization System

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Added

• A new Response struct to simplify response serialization.
  • Added by Christian Noon in Pull Request
    #792.
• A new initializer to the Manager allowing dependency injection of the
  underlying NSURLSession.
  • Added by Christian Noon in Pull Request
    #795.
• Tests around the new Manager initialization methods.

Updated

• Result type to take two generic parameters (Value and Error) where Error
  conforms to ErrorType.
  • Updated by Christian Noon in Pull Request
    #791.
• All response serializers to now return the original server data as NSData?.
  • Updated by Christian Noon in Pull Request
    #791.
• The TaskDelegate to store an error as an NSError instead of ErrorType.
  • Updated by Christian Noon in Pull Request
    #791.
• The ValidationResult failure case to require an NSError instead of ErrorType.
  • Updated by Christian Noon in Pull Request
    #791.
• All tests around response serialization and Result type usage.
  • Updated by Christian Noon in Pull Request
    #791.
• All response serializers to use the new Response type.
  • Updated by Christian Noon in Pull Request -
    #792.
• The designated initializer for a Manager to accept a SessionDelegate parameter
  allowing dependency injection for better background session support.
  • Updated by Christian Noon in Pull Request
    #795.