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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

'ipfs object stat' is a plumbing command to print DAG
node statistics. <key> is a base58 encoded multihash.
It outputs to stdout:

  NumLinks        int number of links in link table
  BlockSize       int size of the raw, encoded data
  LinksSize       int size of the links segment
  DataSize        int size of the data segment
  CumulativeSize  int cumulative size of object and references

core/commands: Don't use pointers for Type field

core/commands: Refactored command marshalers

I made the commands lib dir listing sort the contents
so we get the same sequence of files from it repeatably.

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