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When the request manager receives extensions in a request, it processes them and returns their
response

define types and mock implementation for supporting extensions

Add a default validation policy

add a default validation policy that only accepts selectors up to 100 depth

Send user extensions in request

add the ability to send extensions when creating requests

This reverts commit e8245a51, reversing
changes made to 2cbb73ff.

Update peertaskqueue

Refactor file organization

To reduce future import cycles, and expose more types properly, move the root package to an
interface/types file and move the main implementation into /impl. This also exposes an interface
other implementers can replace.

feat(graphsync): support extension protocol

return a boolean instead of an error if an extention is found on a message

Per https://github.com/ipld/specs/pull/205, metadata is now an extension, and further extensions
will be added soon

Bump go-ipld-prime to 092ea9a7696d

Fix some typo

fix(messagequeue): no retry after queue shutdown

Previously, we allowed the last message send attempt to run to maxRetries if the queue was shutdown,
which also generated warning logs. Now, if a send attempt fails, check that the queue has shutdown
and immediately return if it has

Limit Response Size

limit the size of blocks sent in a response to 512k a.l.a. bitswap

add test to repro errors with message size exceeding in slow connection with large blocks

Remove unneeded old dependencies

Utility functions to construct loaders/storers from a go-blockstore

downgrade logging in ReceiveError to an Info level warning to match Bitswap ReceiveError behavior

update go-ipld-prime

update go-ipld-prime

update go-ipld-prime

Add conn management and update libp2p

Adds callbacks to manage connections, also removes network receiver methods from public graphsync
interface, and updates libp2p to handle go-libp2p-core refactor

feat(ipld): update ipldbridge and integrate

Updates IPLD Bridge to use latest go-ipld-prime and runs and actual round trip test using GraphSync,
go-ipld-prime, and real selectors

Add storer to Graphsync Initialization

Change readme badges to point to go-graphsync

ci(travis): add travis.yml