Subject: Add Deserialization. Method refactor

* Added the deserialization decorator
* changed the decorator to work with Accept: application/xml
  and Accept: application/json
* updated the docstring for the decorator
* added deserialization decorators to methods
* added requestslibs_kwargs to the methods and calls

Change-Id: I582ae0f0b6c5400db6130f6025134ca1d3bfdf23