language: python
cache: pip
python:
  - "2.7"
  - "3.3"
  - "3.4"
  - "3.5"
install:
  - pip install -r requirements.txt
  - pip install -r optional-requirements.txt
  - pip install -e .
script:
  - py.test test

language: python
cache:
  directories:
    - $HOME/.cache/pip
before_cache:
  - rm -f $HOME/.cache/pip/log/debug.log
python:
  - "2.7"
  - "3.3"
  - "3.4"
  - "3.5"
install:
  - pip install -r requirements.txt
  - pip install -r optional-requirements.txt
  - pip install -e .
script:
  - py.test test

Fix pip cache for Travis CI
Fix pip cache for Travis CI
