travis ci: Add pep8 check.

.travis.yml

@@ -3,6 +3,9 @@ language: python
 python:
   - 3.4
 
+before_script:
+  - "pep8 --ignore=E501 --exclude=logbook.py,utils.py ogn"
+
 script:
   - nosetests --with-coverage --cover-package=ogn
 

requirements.txt

@@ -1,6 +1,7 @@
-SQLAlchemy==1.0.8
 nose==1.3.7
 coveralls==0.4.4
+pep8==1.6.2
+SQLAlchemy==1.0.8
 geopy==1.11.0
 manage.py==0.2.10
 celery[redis]>=3.1,<3.2