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true -> always send to peer

false -> use ledger-based strategy described in IPFS paper draft 3

fix(bitswap) pass go vet

fixes #97

https://github.com/jbenet/go-ipfs/issues/97

test(bitswap) run synchronously to aid the scheduler

misc:
* test network client getting more than max
* test for find providers
* rename factory method
* local network
* misc test improvements
* test bitswap get block timeout
* test provider exists but cannot connect to peer
* test sending a message async over local network