Added documentation for docker.io OAuth & Accounts

OAuth docs:
  documented the OAuth authorization flow and how to register your application

Account docs:
  documented getting/updating user profile data
  documented getting/updating user email data

Docker-DCO-1.1-Signed-off-by: Josh hawn <josh.hawn@docker.com> (github: jlhawn)
Fixed typo in Dockerfile example

Docker-DCO-1.1-Signed-off-by: Rob Cannon <rpcann@gmail.com> (github: robpc)

The 'true' command is located in /bin not /usr/bin in the busybox image.
Some distributions no longer include MAKEDEV script.  Stole this from mkimage-rinse.sh.
Docker-DCO-1.1-Signed-off-by: Tim Bosse <taim@bosboot.org> (github: maztaim)
Use a more defensive vendored archive/tar import path to make it clear this isn't upstream's released archive/tar

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
Merge pull request #4365 from maztaim/master

Use mknod instead of MAKEDEV in mkimage-yum.sh
Merge pull request #4318 from robpc/patch-1

Fixed typo in Dockerfile example
Merge pull request #4369 from tianon/better-archive-tar-vendor-import-path

Use a more defensive vendored archive/tar import path to make it clear this isn't upstream's released archive/tar
Updated OAuth docs per arothfusz's comments

Added emphasis of https for OAuth interactions.
Updated example URIs to use HTTPS
Included redirect hostname on authorization page.

Docker-DCO-1.1-Signed-off-by: Josh hawn <josh.hawn@docker.com> (github: jlhawn)
fix docker info with lxc 1.0.0

Docker-DCO-1.1-Signed-off-by: Victor Vieux <victor.vieux@docker.com> (github: vieux)
remove WARNING writter twice

Docker-DCO-1.1-Signed-off-by: Victor Vieux <victor.vieux@docker.com> (github: vieux)
Merge pull request #4376 from vieux/fix_lxc_version

fix docker info with lxc 1.0.0
Merge pull request #4379 from vieux/remove_warnings_twice

remove WARNING writter twice
fix EventsListeners in docker info

Docker-DCO-1.1-Signed-off-by: Victor Vieux <victor.vieux@docker.com> (github: vieux)
one ponted out by lukaspustina, and one that I bet I added

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@fosiki.com> (github: SvenDowideit)
Merge pull request #4319 from jlhawn/docs-docker-io-api

Added documentation for docker.io OAuth & Accounts
Merge pull request #4390 from SvenDowideit/spelling-1

one ponted out by lukaspustina, and one that I bet I added
Merge pull request #4388 from vieux/fix_eventlisteners_nb

fix EventsListeners in docker info
merge existing config when committing

Fixes #1141

Docker-DCO-1.1-Signed-off-by: Wes Morgan <cap10morgan@gmail.com> (github: cap10morgan)