adding pep8 test for Travis

.travis.yml

@@ -20,11 +20,15 @@ install:
     - pip install argparse
     - pip install coverage
     - pip install codecov
+    - pip install pep8
     - pip install -q Django==$DJANGO
     - pip install -q -r requirements.txt
 
+before_script:
+    - "pep8 --exclude=migrations,south_migrations --ignore=E501 helpdesk"
+
 script: 
     - coverage run --source='.' quicktest.py helpdesk
 
 after_success:
-    - codecov
+    - codecov