RestResource payload to generic type

[tmackenzie]

Given a Request When its routed to a RestResource Then the Request and Response should have a ivar payload And the payload's data type is a Java class that represents it's shape

[tmackenzie]

Prep:

• Modify Target and TargetBuilder parameterized generics to include payload
• Extend ^ to have a default payload (for non api calls)
• LocationTranslatorFactory parameterized generics to include payload
• LocationTranslator parameterized generics to include payload
• The above should work with current implementation.

RestRouteRunner:

• RestRequest and RestResponse parameterized generics to include payload
• May need a to modify Between.
• Make a RestRouteRunner
• Inject an JsonTranslator into RestRoutRunner
• Make a RestRequest and RestRequest
• Rewrite RestResource
• Modify LocationBuilder to know when to build a RestRouteRunner

[tmackenzie]

Issue #110 will resolve this.