Add postactivate script I use for virtualenv
Add postactivate script I use for virtualenv

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