Add example docs for python-requests-jwt

docs/examples/python-requests-jwt.md

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+## Accessing PostgREST API using Python Requests and Requests-JWT
+
+The following HTTP client example should work on Python 3.x. If you're using python < 3.x you may need to change the print functions to statements or use:
+
+    from __future__ import print_function
+
+This code relies on setting up the PostgreSQL auth functions and grants correctly first. Follow these instructions:
+
+http://postgrest.com/examples/users/
+
+After completing the configuration, be sure to create a user with email, password, role, and verified flag. We'll use that user to login in the code below.
+
+Install the required libraries
+
+    pip install requests
+    pip install Requests-jwt
+
+Then, from a python interpreter or script:
+
+    import requests
+    import requests_jwt
+    import json
+
+    # email and password auth through postgrest
+    resp = requests.post('http://localhost:3000/rpc/login', json={"email": "you@yours.com", "pass": "dog"})
+    if resp.status_code != 200:
+        raise Exception()
+
+    # JWT auth using the token above
+    token = json.loads(resp.text)['token']
+    auth = requests_jwt.JWTAuth(token)
+    r = requests.get('http://localhost:3000/weight', auth=auth)
+    if r.status_code != 200:
+        raise Exception()
+        
+    for each in r.json():
+        print(each)