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fixes #293

https://github.com/jbenet/go-ipfs/issues/293

programmer error

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

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

impl errorf

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

return a debug error

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

There is a dummy test import: test/lib/random-dep.go
Because godep doen't yet vendor binaries nicely.

until https://github.com/op/go-logging/pull/30 is merged

use a third-party pubsub library for internal communications

Insights:
* Within bitswap, the actors don't need anything more than simple pubsub
behavior. Wrapping and unwrapping messages proves unneccessary.

Changes:
* Simplifies the interface for both actors calling GetBlock and actors
receiving blocks on the network
* Leverages a well-tested third-party pubsub library

Design Goals:
* reduce complexity
* extract implementation details (wrapping and unwrapping data, etc)
from bitswap and let bitswap focus on composition of core algorithms
operations

procedure is to execute
```
cd my/github.com/jbenet/go-multiaddr
git pull
cd my/github.com/jbenet/go-ipfs
godep update github.com/jbenet/go-multiaddr
```

dependencies are vendored into Godeps/_workspace and commit versions are
recorded in Godeps.json

update datastore to e89f0511
update go.crypto