Fixed 'ipfs block put' panic

implement nodebuilder

p2p/net/conn: respect context on dialing

We were half-way with this. there's no way for net.Dialers
to respect contexts, so we have to let the dial finish in
the background.

document some packages

ctx.Done fixes

thanks @whyrusleeping for finding these.

Use multihash not shasum

License: MIT
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>

As shasum is not installed on all machines and
we use multihash anyway in the code base, it
removes one dependency to use shasum instead of
shasum in the tests.

Now that there are sharness tests in multihash
it is also safe to use it.

License: MIT
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>

go-multihash update

gateway: dont cache ipns paths

ipns paths are mutable and should not be cached. this error is
a byproduct of the currently messy gateway route. We should split
the /ipfs and /ipns routes up.

ratelimiter: fixing rate limiter use

Use of the ratelimiter should be conscious of the ratelimiter's
potential closing. any loops that add work to ratelimiter
should (a) only do so if the rate limiter is not closed,
or (b) prevent limiter while work is added
(i.e. use limiter.Go(addWorkHere))

since construction can fail, and construction is non-trivial, it's
probably safer to never assume resource exists.

cc @jbenet @whyrusleeping

exposed the Decider to make configuration nicer @mappum

decalarative configuration is superior. the thread-safety because
important during normal operation

corehttp: allow all webui paths we published.

Otherwise we break users links! cc @mappum

p2p/protocol/identity: smarter tracking observed addrs

- time them out (already was doing that with addrbook)
- keep count to counter symmetric nats

routing/kbucket: fix data race

Gateway Changes

Add ipfs-test-lib.sh

add blocklist to gateway executable