Merge pull request #71 from edx/bmedx/upgrade_django-model-utils

Loosen django-model-utils version, make tox Py version explicit

requirements.txt

 dogapi>=1.2.1,<2.0.0
-django-model-utils>=2.3.1,<3.0.0
+django-model-utils>=2.3.1
 # Use the same DRF version as edx-platform
 git+https://github.com/edx/django-rest-framework.git@1ceda7c086fddffd1c440cc86856441bbf0bd9cb#egg=djangorestframework==3.6.3
 jsonfield>=2.0.2,<3.0.0

setup.py

 #!/usr/bin/env python
 from setuptools import setup
+from submissions import __version__ as VERSION
 
 def is_requirement(line):
     """
@@ -33,7 +34,7 @@ def load_requirements(*requirements_paths):
 
 setup(
     name='edx-submissions',
-    version='2.0.11',
+    version=VERSION,
     author='edX',
     description='An API for creating submissions and scores.',
     url='http://github.com/edx/edx-submissions.git',

submissions/__init__.py

-__version__ = u'2.0.0'
+__version__ = u'2.0.12'

tox.ini

 [tox]
-envlist = django{18,110,111}
+envlist = py27-django{18,110,111}
 
 [testenv]
 deps =