remove obsolete requirements, set up pipenv with dependencies in Pipfile.

.gitignore

@@ -104,7 +104,7 @@ ipython_config.py
 #   However, in case of collaboration, if having platform-specific dependencies or dependencies
 #   having no cross-platform support, pipenv may install dependencies that don't work, or not
 #   install all needed dependencies.
-#Pipfile.lock
+Pipfile.lock
 
 # PEP 582; used by e.g. github.com/David-OConnor/pyflow
 __pypackages__/

Pipfile

@@ -0,0 +1,13 @@
+[[source]]
+name = "pypi"
+url = "https://pypi.org/simple"
+verify_ssl = true
+
+[dev-packages]
+
+[packages]
+django = "*"
+django-thumbs-v2 = "*"
+
+[requires]
+python_version = "3"

requirements.txt

@@ -1,2 +0,0 @@
-django
-django-thumbs-v2