Added type converter to JsonPayload.param

import copy

class JsonResponse:

class JsonPayload:

    def __init__(self, request):

        """

        Object to wrap up simple functionality for parsing a JSON response.

        # Store raw response data

        self.data = request.get_data()

    def param(self, key, default=None):

    def param(self, key, default=None, convert=None):

        """Check if a key exists in a JSON/dictionary payload, and returns it."""

        # If no JSON payload exists, return early

        if not self.json:

            return None

        if key in self.json:

            return self.json[key]

            val = self.json[key]

        else:

            return default

            val = default

        if convert:

            val = convert(val)

        return val

def axes_to_array(coordinate_dictionary, axis_keys=['x', 'y', 'z'], base_array=None):