Remove Droid class

This is from a tutorial and not used
Add jbox2d source code

This really should be included in a jar or as a dependency...that was
giving some grief, plus I like being able to quickly search the source
code.
Initialize the box2d world with a runner and platforms
Change Max fps to 60

The more the merrier!
Initialize the Runner as a box2d dynamic body

This allows the runner to be affected by other objects and gravity.
Add constructor with x, y, width, height
Class to make create sprites affected by physics easier

I'll probably end up redesigning this, but for now this was the quickest
way to get things up and running.
Physics class to hold some constants
Add a renderer for the platforms

This will and endless flow of platforms moving both directions.
Add platform class
Change formatting preferences