Installing via .travis.yml

Installation
3

Thanks! It seems to work - now I just have to make my tests pass. :wink:

before_install:
 - sudo sh -c 'echo "deb http://archive.panda3d.org/ubuntu precise main" >> /etc/apt/sources.list'
 - sudo apt-get update
 - sudo apt-get install panda3d --force-yes