Don't shell out to tar for ExportChanges

This changes ExportChanges to use the go tar support so we can
directly create tar layer files. This has several advantages:

* We don't have to create the whiteout files on disk to get them
  added to the layer

* We can later guarantee specific features (such as xattrs) being
  supported by the tar implementation.

Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
Discard all data on devicemapper devices when deleting them

This works around the fact that deleting a device in a thin pool
doesn't discard the free space. Unfortunately even this is not perfect,
as it seems discards are respected only for blocks that has never been
shared in the thin device code. However, this has been fixed in the
upstream kernel device-mapper tree:

http://git.kernel.org/cgit/linux/kernel/git/device-mapper/linux-dm.git/commit/?h=for-next&id=0ab1c92ff748b745c1ed7cde31bb37ad2c5f901a

When this hits the kernel I belive this will fully return space
for removed images/containers to the host FS. For now it only
helps partially (which is better than nothing).

Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
archive: Extract createTarFile() from ApplyLayer

This way we can reuse it for Untar()

Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
Implement UnTar via archive/tar

This replaces the shelling out to tar with a reimplementation of untar
based on the archive/tar code and the pre-existing code from ApplyLayer
to create real files from tar headers.

Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
Update .mailmap and AUTHORS - we're up to 316 unique contributors by my count!

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
Fix cross compile

stat.Rdev and time.* is 32bit on OSX, which breaks cross builds with eg:
cannot use stat.Rdev (type int32) as type uint64 in function argument

We fix this with an extra conversion to uint64.

Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
detect compressed archives in API /build call

AFAIK in some previous version it was possible to give a compressed docker file
to the API's build command and that was handled properly (aka compression was
detected and archive uncompressed accordingly). Fails with at least 0.7.5.

Fixed this using the DecompressStream method from the archive package.

Docker-DCO-1.1-Signed-off-by: Gereon Frey <me@gereonfrey.de> (github: gfrey)
Stream the cp operation on the client

Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Replace creating buffer

Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Merge pull request #3632 from crosbymichael/stream-cp

Stream the cp operation on the client
Merge pull request #3641 from gfrey/fix_compression

detect compressed archives in API /build call
Added Reference Manual

Docker-DCO-1.1-Signed-off-by: James Turnbull <james@lovedthanlost.net> (github: jamtur01)
Merge pull request #3620 from jamtur01/refman

Added Reference Manual
refactor registers

Docker-DCO-1.1-Signed-off-by: Victor Vieux <victor.vieux@docker.com> (github: vieux)
update commands.go

update docker.go

move to pkg

update docs

update name and copyright

change --sinceId to --since-id, update completion and docs

Docker-DCO-1.1-Signed-off-by: Victor Vieux <victor@docker.com> (github: vieux)
Merge pull request #3322 from vieux/new_flags

new --flags
Merge pull request #3647 from vieux/refactor_registers

refactor registers
Initial driver changes proposal

Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Implement lxc driver

Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Integrate process changes in container.go

Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)