wip with DHT

@whyrusleeping @jbenet this is a WIP with the DHT.

wip

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

Conflicts:
	epictest/addcat_test.go
	exchange/bitswap/testnet/peernet.go
	exchange/bitswap/testutils.go
	routing/mock/centralized_server.go
	routing/mock/centralized_test.go
	routing/mock/interface.go

fix(routing/mock) fill in function definition
feat(integration_test) add make task to perform benchmarks in docker env

pprof cannot be used reliably on OS X. This provides two make tasks to
collect and analyze profiling data.

To run profiling in a dockerized linux environment...
```
make // or `make collect`
```

To analyze results on host machine...
```
make analyze
```

@jbenet @whyrusleeping