Merge branch 'master' of https://git.astron.nl/astron-sdc/esap-userprofile-python-client

Merging from remote.

samp_example.py

+from shopping_client import shopping_client
+
+# this is very raw.
+# Officially it doesn't work because a AAI token is required,
+# but in 'development mode' that part is skipped in the backend, so that the results are returned anyway
+# A proper client should log in with AAI though.
+client = shopping_client(username="vermaas",host="http://localhost:5555/")
+client.get_basket()

shopping_client/shopping_client.py

-import pandas as pd
 import requests
 import json
-import os
 import urllib.parse