Update Cocos2D example.
Update Cocos2D example.

Use a cleaner example, hello_world.py.
Currently runs but doesn't render anything on
my cocos2d install. But neither do their examples
so assuming something is broken in cocos2d or its
usage of the new pyglet.

ghisvail/vispy,jay3sh/vispy,Eric89GXL/vispy,drufat/vispy,inclement/vispy,RebeccaWPerry/vispy,Eric89GXL/vispy,kkuunnddaannkk/vispy,jay3sh/vispy,kkuunnddaannkk/vispy,RebeccaWPerry/vispy,hronoses/vispy,kkuunnddaannkk/vispy,inclement/vispy,julienr/vispy,hronoses/vispy,sh4wn/vispy,srinathv/vispy,inclement/vispy,michaelaye/vispy,drufat/vispy,michaelaye/vispy,sh4wn/vispy,drufat/vispy,QuLogic/vispy,sbtlaarzc/vispy,bollu/vispy,QuLogic/vispy,michaelaye/vispy,ghisvail/vispy,sbtlaarzc/vispy,dchilds7/Deysha-Star-Formation,bollu/vispy,srinathv/vispy,sbtlaarzc/vispy,sh4wn/vispy,hronoses/vispy,Eric89GXL/vispy,jdreaver/vispy,julienr/vispy,dchilds7/Deysha-Star-Formation,ghisvail/vispy,srinathv/vispy,jdreaver/vispy,julienr/vispy,QuLogic/vispy,bollu/vispy,jdreaver/vispy,dchilds7/Deysha-Star-Formation,jay3sh/vispy,RebeccaWPerry/vispy