Upgrade to Django 2.2 and modern DRF and py.test (#1246)

* Upgrade django and stuff

* Update to Django 2.2 and recent versions of similar packages

* Provide explicit orderings to all models used in paginated queries

* Resolve naive datetime warnings in test suite

* Deal with deprecation warnings

* Fix sqlparse version

src/setup.py

@@ -87,21 +87,21 @@ setup(
 
     keywords='tickets web shop ecommerce',
     install_requires=[
-        'Django>=2.1,<2.2',
-        'djangorestframework==3.8.*',
-        'python-dateutil==2.4.*',
+        'Django==2.2.*',
+        'djangorestframework==3.9.*',
+        'python-dateutil==2.8.*',
         'pytz',
-        'django-bootstrap3==10.0.*',
+        'django-bootstrap3==11.0.*',
         'django-formset-js-improved==0.5.0.2',
         'django-compressor==2.2.*',
         'django-hierarkey==1.0.*,>=1.0.2',
-        'django-filter==2.0.*',
+        'django-filter==2.1.*',
         'reportlab==3.5.*',
         'Pillow==5.*',
         'PyPDF2==1.26.*',
         'django-libsass',
         'libsass',
-        'django-otp==0.4.*',
+        'django-otp==0.5.*',
         'python-u2flib-server==4.*',
         'django-formtools==2.1',
         'celery==4.3.*',
@@ -116,7 +116,7 @@ setup(
         'csscompressor',
         'django-markup',
         'markdown<=2.2',
-        'bleach==2.*',
+        'bleach==3.1.*',
         'sentry-sdk==0.7.*',
         'babel',
         'paypalrestsdk==1.13.*',
@@ -144,21 +144,22 @@ setup(
     ],
     extras_require={
         'dev': [
-            'django-debug-toolbar==1.9.1',
-            'sqlparse==0.2.1',
+            'django-debug-toolbar==1.11',
+            'sqlparse==0.3.*',
             'pycodestyle==2.5.*',
             'pyflakes==2.1.*',
             'flake8==3.7.*',
             'pep8-naming',
             'coveralls',
             'coverage',
-            'pytest==3.6.*',
+            'pytest==4.4.*',
             'pytest-django',
-            'pytest-xdist==1.27.*',
+            'pytest-xdist==1.28.*',
             'isort',
-            'pytest-mock==1.6.*',
-            'pytest-rerunfailures',
+            'pytest-mock==1.10.*',
+            'pytest-rerunfailures==7.*',
             'responses',
+            'potypo',
             'freezegun',
         ],
         'memcached': ['pylibmc'],