Update bash completion for "docker run --link" and "docker run -v" to complete on running containers and the local filesystem respectively

Also, add completion for "docker run -a" ("stdin", "stdout", and "stderr"), "docker run --env-file" (local filesystem), and some other minor code style tweaks.

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
Standardize "curl" arguments across the repo to be or include "-sSL"

- https://botbot.me/freenode/docker-dev/msg/17315692/
- https://botbot.me/freenode/docker-dev/msg/17315994/

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
Merge pull request #6885 from tianon/standard-curl-sSL
The installer completed page now contains information on next steps, so is more useful than the intro

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@docker.com> (github: SvenDowideit)
Merge pull request #6755 from tianon/bash-completion-for-link-and-bind

Update bash completion for "docker run --link" and "docker run -v" to complete on running containers and the local filesystem respectively
no need to create a link to the docker binary
Merge pull request #7029 from albers/patch-2

no need to create a link to the docker binary
Add small note about AUFS layer limitation
Docker-DCO-1.1-Signed-off-by: Michaël Pailloncy <mpapo.dev@gmail.com> (github: mpapo)
Update small note about layer limitation
Docker-DCO-1.1-Signed-off-by: Michaël Pailloncy <mpapo.dev@gmail.com> (github: mpapo)
Adjust Link description to match target

The target document headline is "Managing data in containers" and so should the link be named.
Removed legacy api.md file

Docker-DCO-1.1-Signed-off-by: James Turnbull <james@lovedthanlost.net> (github: jamtur01)
Merge pull request #6855 from SvenDowideit/update-osx-installer-image-to-show-final-page

The installer completed page now contains information on next steps, so ...
Merge pull request #7037 from henning/patch-3

Adjust Link description to match target
Merge pull request #6892 from mpapo/docs-docker-aufs-limitation

Add small note about AUFS layer limitation
Merge pull request #7039 from jamtur01/apidoc

Removed legacy api.md file
Add cli.md documentation for docker-pause and docker-unpause

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@docker.com> (github: SvenDowideit)
Add cgroups freezer info

Docker-DCO-1.1-Signed-off-by: Brian Goff <cpuguy83@gmail.com> (github: cpuguy83)

Docker-DCO-1.1-Signed-off-by: Brian Goff <cpuguy83@gmail.com> (github: SvenDowideit)
re-jig the info into all the places

Docker-DCO-1.1-Signed-off-by: SvenDowideit <SvenDowideit@home.org.au> (github: SvenDowideit)