Add a git cleanup to the CI runs

.travis.yml

@@ -16,7 +16,9 @@ env:
 - TOXENV=flake8
 install:
 - pip install tox
-script: tox
+script:
+- git clean -f -d -x
+- tox
 matrix:
   fast_finish: true
 before_install: pip install codecov

appveyor.yml

@@ -18,6 +18,7 @@ install:
   - "c:\\python27\\python c:\\get-pip.py"
   - "c:\\python27\\Scripts\\pip install tox"
 test_script:
+  - "git clean -f -d -x"
   - "c:\\python27\\Scripts\\tox --version"
   - "c:\\python27\\Scripts\\pip --version"
   - "c:\\python27\\Scripts\\tox"