Initial cut of .travis.yml (#72)

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.travis.yml

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language: python
cache: pip
python:
    - 2.7
    - 3.6
    #- nightly
    #- pypy
    #- pypy3
matrix:
    allow_failures:
        - python: 3.6
install:
    #- pip install -r requirements.txt
    - pip install flake8  # pytest  # add another testing frameworks later
before_script:
    # stop the build if there are Python syntax errors or undefined names
    - flake8 . --count --exclude=./Python-2.7.13 --select=E901,E999,F821,F822,F823 --show-source --statistics
    # exit-zero treats all errors as warnings.  The GitHub editor is 127 chars wide
    - flake8 . --count --exclude=./Python-2.7.13 --exit-zero --max-complexity=10 --max-line-length=127 --statistics
script:
    - test/lint.sh
notifications:
    on_success: change
    on_failure: change  # `always` will be the setting once code changes slow down