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License: MIT
Signed-off-by: Jeromy <jeromyj@gmail.com>

License: MIT
Signed-off-by: Jeromy <jeromyj@gmail.com>

License: MIT
Signed-off-by: Jeromy <jeromyj@gmail.com>

Folks operating at the Unix-filesystem level shouldn't care about that
level of Merkle-DAG detail.  Before this commit we had:

  $ ipfs unixfs ls /ipfs/QmSRCHG21Sbqm3EJG9aEBo4vS7Fqu86pAjqf99MyCdNxZ4/busybox
  /ipfs/QmSRCHG21Sbqm3EJG9aEBo4vS7Fqu86pAjqf99MyCdNxZ4/busybox:
  ... several lines of empty-string names ...

And with this commit we have:

  $ ipfs unixfs ls /ipfs/QmSRCHG21Sbqm3EJG9aEBo4vS7Fqu86pAjqf99MyCdNxZ4/busybox
  /ipfs/QmSRCHG21Sbqm3EJG9aEBo4vS7Fqu86pAjqf99MyCdNxZ4/busybox

I also reworked the argument-prefixing (object.Argument) in the output
marshaller to avoid redundancies like:

  $ ipfs unixfs ls /ipfs/QmSRCHG21Sbqm3EJG9aEBo4vS7Fqu86pAjqf99MyCdNxZ4/busybox
  /ipfs/QmSRCHG21Sbqm3EJG9aEBo4vS7Fqu86pAjqf99MyCdNxZ4/busybox:
  /ipfs/QmSRCHG21Sbqm3EJG9aEBo4vS7Fqu86pAjqf99MyCdNxZ4/busybox

As a side-effect of this rework, we no longer have the trailing blank
line that we used to have after the final directory listing.

The new ErrImplementation is like Python's NotImplementedError, and is
mostly a way to guard against external changes that would need
associated updates in this code.  For example, once we see something
that's neither a file nor a directory, we'll have to update the switch
statement to handle those objects.

License: MIT
Signed-off-by: W. Trevor King <wking@tremily.us>

squash! commands: Added Length field to Response

commands/http: client: Fixed error on unset length

core/commands: Refactored command marshalers

Also:
- map[cmds.EncodingType]cmds.Marshaller -> MarshalMap

cc @mappum @maybebtc

@mappum this optionvalue is a really great abstraction. It makes
maintenance super simple!

@jbenet @whyrusleeping

commands: Return a reader in a Response#Reader method, instead of making Response implementing io.Reader