Added Humans and Zombies to the world
Update .gitignore
Added images
Updated .gitignore
Turned off debug mode
Added test class
Updated classpath
Added JUnit jars and a test case to begin with
Removed current functionality of testing until creating world can be sorted out
New class for AI control
An implementation of the A* algoritm

Given a start position, a goal position and a list of blocked positions
it returns the shortest (usually) path from the start position to the
goal position.

The return is a list of coordinates to go through to get the the goal
position, starting with index 0.
A simple class to test the implementation of the A* algoritm
Fixed an error in the calculation of the G cost
Refactored the check if a node is blocked or closed
Fixed algorithm, no corner cutting
Removed unused functions and added more comments.
Merge branch 'ai-path-finding' into develop
Identity class that will be set as the UserData of every Box2d body.

This will ease the drawing procedure for one. Later on it will heal us
to delete killed bodies.
Set the UserData to an Identity on all of our Box2D bodies
Implemented a draw method that will draw all the bodies present in the world