add category field to the message, closes #251
add category field to the message, closes #251

netantho/MozDef,jeffbryner/MozDef,gsssrao/MozDef,serbyy/MozDef,DarkPrince304/MozDef,526avijitgupta/MozDef,jvehent/MozDef,gsssrao/MozDef,eXcomm/MozDef,ameihm0912/MozDef,ameihm0912/MozDef,gsssrao/MozDef,gdestuynder/MozDef,gdestuynder/MozDef,526avijitgupta/MozDef,serbyy/MozDef,triplekill/MozDef,serbyy/MozDef,eXcomm/MozDef,triplekill/MozDef,triplekill/MozDef,mozilla/MozDef,mpurzynski/MozDef,serbyy/MozDef,Phrozyn/MozDef,gsssrao/MozDef,Phrozyn/MozDef,eXcomm/MozDef,netantho/MozDef,jvehent/MozDef,mozilla/MozDef,526avijitgupta/MozDef,gdestuynder/MozDef,jvehent/MozDef,mozilla/MozDef,526avijitgupta/MozDef,DarkPrince304/MozDef,netantho/MozDef,jeffbryner/MozDef,DarkPrince304/MozDef,jvehent/MozDef,netantho/MozDef,triplekill/MozDef,ameihm0912/MozDef,jeffbryner/MozDef,DarkPrince304/MozDef,mozilla/MozDef,gdestuynder/MozDef,jeffbryner/MozDef,mpurzynski/MozDef,Phrozyn/MozDef,Phrozyn/MozDef,ameihm0912/MozDef,eXcomm/MozDef,mpurzynski/MozDef,mpurzynski/MozDef