Travis CI configuration (.travis.yml)

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Since it took me a while to figure out, heres a .travis.yml file which you can use to configure Travis. It downloads and installs a panda3d development build on ubuntu, and then runs main.py:

language: cpp
sudo: required
dist: trusty
compiler: gcc
addons:
    apt:
        sources:
        - sourceline: "deb http://archive.panda3d.org/ubuntu/ trusty-dev main"
        packages:
            - cmake
            - libeigen3-dev
            - libfreetype6-dev
            - panda3d1.10

script:
    - export PYTHONPATH=${PYTHONPATH}:/usr/lib/python2.7/dist-packages
    - export PYTHONPATH=${PYTHONPATH}:/usr/share/panda3d
    - python2.7 main.py