Update the Logical Router NatRules to be compatible with the NVP 3.x.x
platform

Use the Gson adapters to serialize/deserialize the NatRules

Switch the NiciraNvpApi to a single gson Object with the proper adapters

Fix missing order setting for static nat rules and portforwarding rules

Return an error when a port range is passed in a portforwarding rule

The serializer is not required

Fix a bug where an ip address could be released even if it was still in
use for SourceNat

Throw a json parse exception when the type is unknown to the adapter