enable flake8 in tox and Travis configs

Author: mattsb42-aws

.travis.yml

@@ -110,7 +110,6 @@ matrix:
       env: TOXENV=pypy-pycrypto-norsa
     - python: pypy3.5
       env: TOXENV=pypy-compatibility
-# matrix:
-#   include:
-#     - python: 3.6
-#       env: TOX_ENV=flake8
+    # Linting
+    - python: 3.6
+      env: TOX_ENV=flake8

tox.ini

@@ -43,8 +43,8 @@ extras =
     pycrypto: pycrypto
     compatibility: {[testenv:compatibility]extras}
 
-; [testenv:flake8]
-; commands = flake8 jose
-; skip_install= True
-; deps =
-;     flake8
+[testenv:flake8]
+skip_install= True
+deps =
+    flake8
+commands = flake8 jose setup.py