Will install different versions of django on travis

Author: owais

tests/install.sh

@@ -1,3 +1,4 @@
 #!/usr/bin/env bash
+pip install Django==$DJANGO_VERSION
 pip install -r requirements.txt
 npm install

tests/requirements.txt

@@ -1,3 +1,2 @@
-Django
 coveralls
 coverage