Initial libgdx Project

Initial creation and import of libgdx projects
GDX Artemis

Added dependency for gdx-artemis
Artemis Test

First classes to baby step into using Artemis
"Pong" Test Working

Basic systems that allows the user to move a ball around the screen with
some basic physics interactions (e.g. drag, walls). Mostly a good demo
of a simple component / system design.
Merge remote-tracking branch 'origin/libgdx-init'