Travis CI: Replace pep8 with flake8

.travis.yml

@@ -4,7 +4,7 @@ python:
   - 3.4
 
 before_script:
-  - "pep8 --ignore=E501 --exclude=logbook.py,utils.py ogn"
+  - flake8 tests ogn
 
 script:
   - nosetests --with-coverage --cover-package=ogn

requirements.txt

@@ -1,6 +1,6 @@
 nose==1.3.7
 coveralls==0.4.4
-pep8==1.6.2
+flake8==2.5.0
 SQLAlchemy==1.0.8
 geopy==1.11.0
 manage.py==0.2.10

setup.cfg

@@ -0,0 +1,2 @@
+[flake8]
+ignore = E501