I've dry hopped my first beer, a pale ale, by tossing some pellets into the carboy. After 2 days, I now seem to have a few mm of oil sitting on top of my beer. I assume this is normal since the whole point is to extract the oils and aromas from the hops, but I'm not sure what to do with it. When I keg it, should I try to leave the oil out? Or mix it all in? Or will the oil magically dissapear?