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Since the DagReader has lots of useful information (like sizes etc)
it's good to be able to use it.

improve efficiency of multilayered indirect blocks

clean up tests

panic cleanup

clean up logic, improve readability

add final root node to the dagservice upon creation

importer: simplified dag generation

test: updated hashes using latest code

@whyrusleeping this is why the sharness tests
were failing: the hashes are added manually to
make sure our generation doesn't change.

cleanup after CR

fix merkledag tests

fix small block generation (no subblocks!)

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

not internal since io needs it

fix(fuse/ipns) use pb package

fix(fuse) import protos from unixfs/pb package

cc @jbenet

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

dependencies are vendored into Godeps/_workspace and commit versions are
recorded in Godeps.json

update datastore to e89f0511
update go.crypto