fix torrent requesting same piece from multiple peers, some cleanup
simple average up/down rate, output rates
Merge pull request #4 from iantocristian/master

version 0.2.0
Additional logging in peer, torrent and tracker. No logic changes.
Merge branch 'master' of github.com:artsalliancemedia/node-torrent-client

Conflicts:
	lib/peer.js
	lib/torrent.js
peer.js logging
Merge pull request #5 from darsee/master

Some additional logging in peer, torrent and tracker. No logic changes.
file busy handling
peer throttling