Add all of the requirements readthedocs.org uses for its own documentation

requirements.txt

@@ -1 +1,103 @@
+# Base packages
+pip==10.0.1
+appdirs==1.4.3
+virtualenv==16.0.0
+docutils==0.14
+Sphinx==1.7.4
+sphinx_rtd_theme==0.3.1
+
+Pygments==2.2.0
+
+mkdocs==0.17.3
+
+django==1.9.13
+six==1.11.0
+future==0.16.0
+
+# django-tastypie 0.13.x and 0.14.0 are not compatible with our code
+django-tastypie==0.13.0
+
+django-guardian==1.4.9
+django-extensions==2.0.7
+
+# djangorestframework 3.7.x drops support for django 1.9.x
+djangorestframework==3.6.4
+
+# Filtering for the REST API
+django-filter==1.1.0
+
+django-vanilla-views==1.0.5
+jsonfield==2.0.2
+
+requests==2.18.4
+requests-toolbelt==0.8.0
+slumber==0.7.1
+lxml==4.2.1
+defusedxml==0.5.0
+
+# Basic tools
+redis==2.10.6
+celery==4.1.1
+
+# django-allauth 0.33.0 dropped support for Django 1.9
+# https://django-allauth.readthedocs.io/en/latest/release-notes.html#backwards-incompatible-changes
+django-allauth==0.32.0
+
+dnspython==1.15.0
+
+# VCS
+httplib2==0.11.3
+GitPython==2.1.10
+
+# Search
+elasticsearch==1.5.0
+pyelasticsearch==0.7.1
+pyquery==1.4.0
+
+# Utils
+django-gravatar2==1.4.2
+pytz==2018.4
+beautifulsoup4==4.6.0
+Unipath==1.1
+django-kombu==0.9.4
+mock==2.0.0
+
+# stripe 1.20.2 is the latest compatible with our code base (otherwise
+# gold/tests/test_forms.py fails)
+stripe==1.20.2
+
+django-formtools==2.1
+
+# docker is pinned to 3.1.3 because we found some strange behavior
+# related to timeouts on EXEC with 3.2.1 and 3.3.0 that's not present
+# with 3.1.3
+# https://github.com/rtfd/readthedocs.org/issues/3999
+docker==3.1.3
+
+django-textclassifier==1.0
+django-annoying==0.10.4
+django-messages-extends==0.6.0
+djangorestframework-jsonp==1.0.2
+django-taggit==0.22.2
+dj-pagination==2.3.2
+
+# Docs
+sphinxcontrib-httpdomain==1.6.1
+
+# commonmark 0.5.5 is the latest version compatible with our docs, the
+# newer ones make `tox -e docs` to fail
+commonmark==0.5.5
+
+# Replace recommonmark with its latest version
+# recommonmark==0.4.0
 git+https://github.com/rtfd/recommonmark.git
+
+# Version comparison stuff
+packaging==17.1
+
+# Commenting stuff
+django-cors-middleware==1.3.1
+nilsimsa==0.3.8
+
+# User agent parsing - used for analytics purposes
+user-agents<1.2.0