Updating travis file to use Makefile commands

.travis.yml

@@ -3,11 +3,8 @@ python:
     - 3.4
 
 before_install:
-    - pip install pep8
+    - make setup
-    - pip install django
+
-    - pip install djangorestframework
-    
 script:
-    - python pep_check.py
+    - make style
-    - python InvenTree/manage.py check
+    - make test
-    - python InvenTree/manage.py test --noinput