Last I heard:
Logged in roaming from Europe (during biggest floods in Bosnia)
and, back on-topic:
let Grunt or Gulp take care of prefixing, why would you even want to maintain this when you can abstract it and let the community keep up with changes.
I you want grunt/gulp for all they offer, that’s great. But if you really only need to solve this problem, I’d suggest using one of the wide variety of prefixer-type mixins in major sass libraries (compass and bourbon both have them, for example).