Integrate prospector into Travis CI

Closes #947

.prospector.yaml

@@ -0,0 +1,31 @@
+test-warnings: true
+
+ignore-paths:
+  - gunicorn/_compat.py
+  - gunicorn/argparse_compat.py
+  - gunicorn/selectors.py
+  - gunicorn/six.py
+  - build
+  - docs
+  - examples
+  - scripts
+  - tests/requests/valid
+  - tests/requests/invalid
+
+pep8:
+  disable:
+    - E126
+    - E128
+    - E129
+    - E302
+    - E501
+
+pyflakes:
+  disable:
+    # Redefinition of unused $X from line $LINE
+    - F811
+    # Access to a protected member $X of a client class
+    - W0212
+
+mccabe:
+  run: false

.travis.yml

@@ -16,6 +16,8 @@ matrix:
       env: TOXENV=py36-dev
     - python: nightly
       env: TOXENV=py37
+    - python: 3.5
+      env: TOXENV=lint
   allow_failures:
     - env: TOXENV=py36-dev
     - env: TOXENV=py37

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py26, py27, py34, py35, py36, py36-dev, py37, pypy
+envlist = py26, py27, py34, py35, py36, py36-dev, py37, pypy, lint
 skipsdist = True
 
 [testenv]
@@ -10,3 +10,7 @@ deps =
   py26: unittest2
   py{26,27},pypy: mock
   py{34,35,36,36-dev,37}: aiohttp
+
+[testenv:lint]
+commands = prospector
+deps = prospector