Improvement to Consumes Deserialization

Related: #713 and #657
Sorry, the correct lines would be: 
Here I use a parameter with the same name of JSON property and use `WithoutRoot`
https://github.com/renanigt/vraptor4/blob/improveConsumesDeserialization/vraptor-core/src/test/java/br/com/caelum/vraptor/serialization/gson/GsonDeserializerTest.java#L136

https://github.com/renanigt/vraptor4/blob/improveConsumesDeserialization/vraptor-core/src/test/java/br/com/caelum/vraptor/serialization/gson/GsonDeserializerTest.java#L224