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+ added recursive pinning func

Caused panic.

(test was failing)

Erroring out in core setup should cancel the context
to ensure subsystems are shut down. This has to happen
all over the place we use contexts.

@perfmode @whyrusleeping

**For now**, we don't need to load/parse the private key
(which causes a signficant delay in commands) when doing
things entirely offline. This may change, and in that case
the private key should be loaded on demand.

WARNING: change breaks old configs.
@whyrusleeping @perfmode

This commit changes the way addresses are stored in config files.
It lumps Identity.Address and RPCAddress into Addresses. This
commit also fixes several golint issues.

true -> always send to peer

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

for now, ipfs add output format:

    added <hash> <path>
    ...

(these commands will adhere to strict formats.)

style(exch:bitswap) rename NetMessage adapter impl