Restructured Shadow and Ngon classes to inherit from the Drawable class which contains much all of the boilerplate OpenGL code.

Also added the Radial class to draw a radial gradient to simulate lighting.

Changed background colour to black for the new lighting effect.
Restructured Shadow and Ngon classes to inherit from the Drawable class which contains much all of the boilerplate OpenGL code.

Also added the Radial class to draw a radial gradient to simulate lighting.

Changed background colour to black for the new lighting effect.
Merge branch 'master' of github.com:Kzone272/shadow_casting

Conflicts:
	bin/ShadowCasting.apk
	bin/classes.dex
	bin/classes/com/shadowcasting/Ngon.class
	bin/classes/com/shadowcasting/OpenGLES20$1.class
	bin/classes/com/shadowcasting/OpenGLES20.class
	bin/classes/com/shadowcasting/Shadow.class
	src/com/shadowcasting/Ngon.java
	src/com/shadowcasting/OpenGLES20.java
	src/com/shadowcasting/Shadow.java