Merge pull request #5 from ljusman/master

Test Soccer Ball Image
Merge pull request #6 from ljusman/master

AI Implementation (finally)
Added basic level structures
Added tmx loading
Added basic tests for player.py
Added travis-ci support
Added Travis-CI build status image
Added additional requirements for pygame
Changed requirements installation from pip to apt-get
Updated .travis.yml
Updated install script
Added virtualenv system-site-packages flag
Override default install script
Remove requirements.txt
Added rendering of sample level
Added basic collision detection in the y direction
removed constants and travis.yml files
Updated .gitignore
Added collision layer
Merge branch 'tests-and-levels-minus-travis-ci' of https://github.com/markbahnman/PyRun into tests-and-levels-minus-travis-ci