Add flake8 to requirements

.travis.yml

@@ -19,6 +19,7 @@ install:
   - pip install Pillow==2.3.0
   - pip install django-guardian==1.2.3
   - pip install pytest-django==2.6.1
+  - pip install flake8==2.2.2
   - "if [[ ${TRAVIS_PYTHON_VERSION::1} != '3' ]]; then pip install oauth2==1.5.211; fi"
   - "if [[ ${TRAVIS_PYTHON_VERSION::1} != '3' ]]; then pip install django-oauth-plus==2.2.4; fi"
   - "if [[ ${TRAVIS_PYTHON_VERSION::1} != '3' ]]; then pip install django-oauth2-provider==0.2.4; fi"

requirements-test.txt

@@ -2,6 +2,7 @@
 pytest-django==2.6
 pytest==2.5.2
 pytest-cov==1.6
+flake8==2.2.2
 
 # Optional packages
 markdown>=2.1.0

tox.ini

@@ -13,6 +13,7 @@ commands = ./runtests.py --fast
 [testenv:flake8]
 basepython = python2.7
 deps = pytest==2.5.2
+       flake8==2.2.2
 commands = ./runtests.py --lintonly
 
 [testenv:py3.4-django1.7]