Improve tracker announce behavior, Decrease log spam on torrent stop

Avoid logging InterruptedException when a torrent is stopped

Fix BT Announce Behavior

Correctly send left state to the tracker (currently this is always zero)
Always send upload, download to the tracker, not just during the completion event.
Trigger a tracker announce immediately after a torrent is started
Request zero peers when stopping the torrent
Request zero peers when the torrent is completed (the current code flow does not easily allow these peers to be put in the registry, so it's better not to request them)
More robustly ensure that a completed event is not sent if the torrent was started as a seed
Config change: follow default tracker announce interval if announce interval is unspecified
Memory leak fix on torrent stop: remove extraTrackers and peerSources when a torrent is stopped
Add configuration parameter for tracker connect timeout
UDP tracker resend behavior now adheres to BEP-0015
Fix memory/resource leak: tracker resources are closed on torrent stop rather than on shutdown
Apache httpclient is now closed.
Cleanup HTTP tracker query code
Make HttpTracker extensible to add additional parameters. Example: https://wiki.theory.org/BitTorrent_Location-aware_Protocol_1.0_Specification
Bump httpclient to 4.5.13

atomashpolskiy / bt