Custodia Quick Start doesn't works properly

I'm following the quick start at https://custodia.readthedocs.io/en/latest/quick.html and I'm getting the following error:

(custodia) ➜  custodia git:(master) ✗ bin/custodia quick.conf 
Traceback (most recent call last):
  File "bin/custodia", line 25, in <module>
    main()
  File "bin/custodia", line 19, in main
    func = ep.resolve()
  File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2408, in resolve
    module = __import__(self.module_name, fromlist=['__name__'], level=0)
  File "/home/moguimar/workspaces/secret-management/custodia/src/custodia/server/__init__.py", line 12, in <module>
    from custodia.httpd.server import HTTPServer
  File "/home/moguimar/workspaces/secret-management/custodia/src/custodia/httpd/server.py", line 17, in <module>
    from custodia.compat import parse_qs, unquote, urlparse
  File "/home/moguimar/workspaces/secret-management/custodia/src/custodia/compat.py", line 12, in <module>
    from backports import configparser
ImportError: No module named backports

Steps I've done so far:

cloned this repo
make egg_info
create config file
create log dir
try to run bin/custodia quick.conf

I have the following modules installed in my virtual env:

asn1crypto (0.24.0) certifi (2018.1.18) cffi (1.11.5) chardet (3.0.4) configparser (3.5.0) cryptography (2.2.1) enum34 (1.1.6) idna (2.6) ipaddress (1.0.19) jwcrypto (0.4.2) pip (9.0.3) pycparser (2.18) requests (2.18.4) setuptools (39.0.1) six (1.11.0) urllib3 (1.22) wheel (0.30.0)

I'm using pythoh 2.7.14

latchset / custodia

Custodia Quick Start doesn't works properly #242