vendor: goamz/aws and goamz/s3

This is an unhandled case. Right now, we close the stream without
reading. Should clients be able to satisfy routing requests?

@jbenet @whyrusleeping

fix(corerouting): connect to routing servers when setting up GCR client

doc(corerouting) add TODO to move stuff to routing bootstrap

remove dialer from GCR client

this might solve all our problems

fix for #757

have repo tilde expand paths

gateway: attempt to resolve hostname to ipfs path

fix a panic caused by context cancelling closing a promise channel

Fixed 'ipfs block put' panic

implement nodebuilder

p2p/net/conn: respect context on dialing