Merge pull request #25 from cclauss/patch-2

Add flake8 to the testing, Python 2.7.12 -> 2.7.13

Author: murali-reddy

.travis.yml

@@ -1,10 +1,19 @@
+sudo: false
+dist: trusty
 language: python
 cache: pip
 python:
   - "2.7.10"
-  - "2.7.12"
+  - "2.7.13"
   - "3.5"
   - "3.6"
+before_install:
+  - pip install flake8
+before_script:
+  # stop the build if there are Python syntax errors or undefined names
+  - flake8 . --count --select=E901,E999,F821,F822,F823 --statistics
+  # exit-zero treates all errors as warnings.  The GitHub editor is 127 chars wide
+  - flake8 . --count --exit-zero --max-line-length=127 --statistics
 install:
   - python setup.py install
   - pip install pexpect