Returns a pyalveo.Client given a json string built from the client.to_json() method.

def from_json(json_data):
        """
            Returns a pyalveo.Client given a json string built from the client.to_json() method.
        """
        # If we have a string, then decode it, otherwise assume it's already decoded
        if isinstance(json_data, str):
            data = json.loads(json_data)
        else:
            data = json_data
        oauth_dict = {
                      'client_id':data.get('oauth',{}).get('client_id',None),
                      'client_secret':data.get('oauth',{}).get('client_secret',None),
                      'redirect_url':data.get('oauth',{}).get('redirect_url',None),
                      }
        client = Client(api_key=data.get('api_key',None),
                        api_url=data.get('api_url',None),
                        oauth=oauth_dict,
                        use_cache=data.get('use_cache',None),
                        cache_dir=data.get('cache_dir',None),
                        update_cache=data.get('update_cache',None),
                        verifySSL=data.get('oauth',{}).get('verifySSL',None)
                        )
        client.cache = Cache.from_json(data.get('cache',None))
        client.oauth = OAuth2.from_json(data.get('oauth',None))
        return client