adding expires attribute to the token model and noting that roles_links attribute is missing in the user model.
Add a conftest and unittest.json.config to run unittests. Should close #2.
#3 - Test conversion of Auth model to JSON.
[#3] Test for conversion from json of Roles object.
[#3] Add unit test for Tokens API Client.
pep8 compliance
added version model
added check for link dict having key type
added _list_to_obj for MediaTypes
added to obj methods for version class
added tags to classes, fixed a inhertiance class reference for Role class
added extensions api, and base class
moved version to its own api
fixed endline
added init file for respones model
added user class for users_api
added tenant class to tenant api
fixed spelling error
replaced root_tag with tag
fixed method declaration