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Queries now can be cancelled and the resources collected

ipfs blocks local returns _all_ local refs. For now this is one
long op. future commits will make it async.

this is a dirty hack

fix: remove merkledag import

may need to squash this commit into the merkledag move commit

also move network setup into its own self-contained func

fix ping test

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

Conflicts:
	core/commands/root.go

begin ping command, WIP

finish initial ping implementation