Add node resource_limits options

I need to fix the README, but I'm not sure if it's ideal to continue following the same format for these entries as it'll add a lot of bulk for things some people may most like not use. I also omitted a lot of "uncommon" options, should I have included them as well?
@ekohl Any comments on the format of this? It doesn't follow the same standard, but if I did it'll take up a lot of space.