remove unncessary pep8 checking now we have it handled via pytest

.travis.yml

@@ -1,14 +1,11 @@
 language: python
 sudo: false
-before_install:
-  - time pip install pep8
 
 install:
 - pip install -r requirements.txt
 
 script:
-  - pep8 --ignore E201,E202 --max-line-length=120 --exclude='migrations' .
-  - make test
+  - py.test
 
 notifications:
   email: