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We already setup the connection from within the new connection handler. No need
to do it *again* on dial.

clear out extra dial jobs after dial finishes

ci: fix travis build

enable ipv6

preallocate duplicate checking map in Peers

Update Travis CI to use standard test script.

We call this method in `FindProvidersAsync`. Really, we shouldn't even be doing
that (but this is "good enough" for now).

nil out references to finished dials

We need a better solution (this is a memory hotspot when mass dialing) but that
will take some thought and effort. This is a simple fix that should reduce
memory usage a bit.

This also switches from goveralls to codecov.

don't pass the dial timeout option

It doesn't exist anymore. This is now handled entirely though contexts.

gx: update go-peerstream

don't backoff dialing when the context is canceled

fixes libp2p/go-libp2p-kad-dht#96

use optimized 'HaveConnToPeer' checks

Update stream muxer.

* Add in the reset method and use it instead of Close. Close now only closes one
  side of the connection.

gx: update go-ws-transport

test: connect each peer precisely once.

Otherwise, some tests will get confused by duplicate (temporary, we close
duplicates quickly) connections.

fixes libp2p/go-libp2p#100

gx: update go-cid, go-multibase, base32

gx: update go-reuseport