dj-database-url requirement missing from development.txt

[binarysubstrate]

Description

runtests.py throws ImportError using the given requirements in development.txt:

Failing Command

PYTHONPATH='.' python runtests.py

ImportError: No module named 'dj_database_url'

Conda Packages and Versions

conda list

Django 1.10
django-nose 1.4.4
libpq 9.5.4 0
mock 2.0.0 py35_0
nose 1.3.7
openssl 1.0.2j 0
pbr 1.10.0 py35_0
pip 9.0.1 py35_0
psycopg2 2.6.2 py35_0
python 3.5.2 0
readline 6.2 2
setuptools 27.2.0 py35_0
six 1.10.0 py35_0
sqlite 3.13.0 0
tk 8.5.18 0
wheel 0.29.0 py35_0
xz 5.2.2 0
zlib 1.2.8 3