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This commit adds a Mount abstraction (which is really just
a wrapped context closer). It makes sure to bind the mount
to the fate of the Node (i.e. close it if the node ends).
This fixes #350

vanilla:
    21.57 real        45.14 user         8.51 sys

short:
    14.40 real        31.13 user         5.56 sys

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

https://github.com/jbenet/go-ipfs/issues/270

- distinguish log.Error and log.Errorf functions
- Initialize structs with field names
- A bit of unreachable code (defers)

not internal since io needs it

fix(fuse/ipns) use pb package

fix(fuse) import protos from unixfs/pb package

![](http://m.memegen.com/77n7dk.jpg)

cc @jbenet

    type NameSystem interface {
      Resolver
      Publisher
    }

should say it all.

cc @whyrusleeping

working on dag modification structures, factored out the data format into an importer subpackage and added more ipns tests