Added flake8 to tox and travis

Author: waylan

.travis.yml

@@ -4,6 +4,7 @@ env:
   - TOXENV=py32
   - TOXENV=py33
   - TOXENV=py34
+  - TOXENV=flake8
 before_install:
   - sudo apt-get update -qq
   - sudo apt-get install libtidy-0.99-0

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py27, py31, py32, py33, py34
+envlist = py27, py31, py32, py33, py34, flake8
 
 [testenv]
 downloadcache = {toxworkdir}/cache
@@ -9,3 +9,10 @@ deps = nose
        pytidylib
 commands = coverage run --source=markdown {toxinidir}/run-tests.py {posargs}
            coverage report --show-missing
+
+[testenv:flake8]
+deps = flake8
+commands = flake8 {toxinidir}/markdown {toxinidir}/tests {toxinidir}/setup.py {toxinidir}/run-tests.py
+
+[flake8]
+max-line-length = 119