Better interoperation between Json::Value and JsonObject.

* Generic functions to add entries to both object models.
* Add Json::Value into JsonObjects.
* Write Json::Value to string incrementally.
* Get rid of ripple::RPC::New namespace

src/ripple/rpc/impl/Status.cpp

@@ -21,7 +21,6 @@
 
 namespace ripple {
 namespace RPC {
-namespace New {
 
 std::string Status::codeString () const
 {
@@ -72,6 +71,5 @@ void Status::fillJson (Json::Value& value)
     }
 }
 
-} // namespace New
 } // namespace RPC
 } // ripple