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This commit cleans up how mounting was being done.
It now successfully signals when it is properly mounted
and listen to close signals correctly.

I broke out multiaddr/net to its own package so
that multiaddr parsing could remain lean. multiaddr-net
will vendor special implementations of protocols (like utp)

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

@jbenet

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

@jbenet

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

@jbenet

now, ipfs can be built and executed in one step:
```
docker run jbenet/go-ipfs daemon --initialized
```

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

@jbenet @whyrusleeping @mappum

very helpful for tracking down errors. the stack traces are only
shown when debug mode is visible. They function best when caught at the
source.

I propose we use this errors package as a drop-in replacement for
fmt.Errorf and errors.New in all of our code, and use errors.Wrap for
external errors as they emerge from others' libraries.

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>
Signed-off-by: Brian Tiger Chow <brian.holderchow@gmail.com>

This commit changes the signal handler to be added once
the command is executing. this is because the daemon
has its own signal handler, that must try to shut down
the node gracefully first. You know, just in case.

can replace if desired, but at least it's not an end-user TODO