Add tox.ini to enable tox testing.

.gitignore

@@ -81,6 +81,7 @@ test_root/export_course_repos/
 test_root/paver_logs/
 test_root/uploads/
 django-pyfs
+.tox/
 
 ### Installation artifacts
 *.egg-info

tox.ini

+[tox]
+envlist = py27-django{18,111}
+
+[testenv]
+setenv =
+    PYTHONHASHSEED = 0
+passenv =
+    EDX_PLATFORM_SETTINGS
+    EDXAPP_TEST_MONGO_HOST
+deps =
+    django18: Django>=1.8,<1.9
+    django111: Django>=1.11,<2
+    -rrequirements/edx/pre.txt
+    -rrequirements/edx/github.txt
+    -rrequirements/edx/local.txt
+    -rrequirements/edx/base.txt
+    -rrequirements/edx/development.txt
+    -rrequirements/edx/testing.txt
+    -rrequirements/edx/post.txt
+
+commands =
+    pytest {posargs}