Up the kbucket limit

(I managed to start working on OpenBazaar (indirectly) at work, I'm now playing with the libtorrent dht and it's quite amazing, it's my goal to learn how to use it properly so that I can bring it here and replace this one for that one, it's proven to scale to tens of millions of nodes daily (with a churn of about 5-10million nodes a day), it's mature, resistent to lots of attacks, it's implemented with async-io, and lots of io tricks to make it very efficient, it's got nat punching, you name it it's got it, and it's extensible)