Update versions to previously used

.travis.yml

@@ -15,8 +15,8 @@ before_install:
 install:
   - pip install -q Django==$DJANGO --use-mirrors
   - pip install . --use-mirrors
-  - pip install coverage==4.0b3
-  - pip install coveralls==1.0b1
+  - pip install coverage==3.7.1
+  - pip install coveralls==0.5
 script:
   - coverage run --source=jet --omit=*/migrations/*,*/south_migrations/*,*/tests/* manage.py test jet
 after_success: