Add code for Pardot implementation to docs

Docker-DCO-1.1-Signed-off-by: O.S. Tezer <ostezer@gmail.com> (github: ostezer)
registry: adding vbatts to the MAINTAINERS

Docker-DCO-1.1-Signed-off-by: Vincent Batts <vbatts@redhat.com> (github: vbatts)
Dockerfile: updated ubuntu release used for builds

This patch just revs the Ubuntu release used for builds from 13.10
to 14.04.

Docker-DCO-1.1-Signed-off-by: Aleksa Sarai <cyphar@cyphar.com> (github: cyphar)
Merge pull request #5635 from vbatts/vbatts-registry_maintainers
Start separating the image subsystem

This is a first step towards moving all code related to local
manipulation of images into a cleanly separated subsystem,
accessible via a stable set of commands in the engine API.

`graph.TagStore` now implements `engine.Installer`. For now, it
is installed by `Server.InitServer`, along with all other Server
commands. However this will change in future patches.

`graph.TagStore.Install` registers the following commands:

* `image_set` creates a new image and stores it locally.
* `image_get` returns information about an image stored locally.
* `image_tag` assigns a new name and tag to an existing image.

These commands are a pre-requisite for moving 'push' and 'pull'
out of `Server`.

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)
Merge pull request #5432 from shykes/image-subsystem-1
Merge pull request #5716 from shykes/pr_out_engine_receiver_and_sender_preserve_job_env
Fix bug on LXC container start. Fixes #5718
Docker-DCO-1.1-Signed-off-by: Fernando Mayo <fernando@tutum.co> (github: fermayo)
Remove signal_freebsd (already in pkg/signal)

Docker-DCO-1.1-Signed-off-by: Guillaume J. Charmes <guillaume@charmes.net> (github: creack)
Integration test for link and unlink containers

Docker-DCO-1.1-Signed-off-by: Fabio Falci <fabiofalci@gmail.com> (github: fabiofalci)
Give the Redirect a HostName - filled in from the s3 bucket name.

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@fosiki.com> (github: SvenDowideit)
reduce cache time to 1 hours so future docs releases update the cloudfront caches faster

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@fosiki.com> (github: SvenDowideit)
libcontainer: Create dirs/files as needed for bind mounts

If you specify a bind mount in a place that doesn't have a file yet we
create that (and parent directories). This is needed because otherwise
you can't use volumes like e.g. /dev/log, as that gets covered by the
/dev tmpfs mounts.

Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
Merge pull request #5730 from SvenDowideit/fix-hostname-for-redirects

Give the Redirect a HostName - filled in from the s3 bucket name.
Merge pull request #5731 from SvenDowideit/reduce-cache-max-age

reduce cache time to 1 hours so future docs releases update the cloudfront caches faster
Merge pull request #5621 from ostezer/docs-add-pardot

Add code for Pardot implementation to docs
Merge pull request #5741 from creack/remove_unused_file-2

Remove signal_freebsd (already in pkg/signal)
Merge pull request #5729 from fabiofalci/link_unlink_test

Integration test for link and unlink containers
Correct a comment in libcontainer Mount Namespace setup.
Docker-DCO-1.1-Signed-off-by: Vishnu Kannan <vishnuk@google.com> (github: vishh)
Merge pull request #5712 from vishh/fix_typo

Correct a libcontainer Mount Namespace setup comment.