* merge 9d04e4c from https://github.com/jzelinskie/chihaya
* sanitize ip address on Scrape requests
* remove NewConnectionID and ValidConnectionID functions from production code
* delete info hash count key from redis (replaced with SCARD on infohash set)
* add GC test
* add peer.Addr() functio to always return unwrapped address if 4to6 appear