Added example to sandbox GLSL on the spinning cube demo.
Added example to sandbox GLSL on the spinning cube demo.

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