Document the pause and unpause commands available on API v1.12 onwards

Docker-DCO-1.1-Signed-off-by: Abel Muiño <amuino@gmail.com> (github: amuino)
Add mutex warning when specifying -icc or -ip-forward and -iptables=false

Docker-DCO-1.1-Signed-off-by: Erik Hollensbe <github@hollensbe.org> (github: erikh)
Merge pull request #6651 from erikh/6002-conflicting-iptables-options

Add mutex warning when specifying -icc or -ip-forward and -iptables=false
Change floats to ints recursively on env encoding

Fixes #6246
Docker-DCO-1.1-Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com> (github: LK4D4)
Merge pull request #6659 from vieux/pr_6248

Change floats to ints recursively on env encoding
Merge pull request #6658 from amuino/doc_pause_unpause

Document the pause and unpause commands available on API v1.12 onwards
fix tests

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
Merge pull request #6656 from andersryanc/master

Remove Docs viewport tag to fix iPhone scaling
Add benchmarks on TrucnIndex.Delete

Docker-DCO-1.1-Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com> (github: LK4D4)
Update dockervolumes.md

~~~
kyu@kyu-HP-EliteBook-2570p:~/apps/docker/volume$ docker run -v /dbdata --name dbdata2 ubuntu
2014/06/25 14:17:44 Error response from daemon: No command specified
~~~
Add ticks to docker links userguide, was not being rendered properly, fix spelling error in /etc/hosts

Docker-DCO-1.1-Signed-off-by: Erik Hollensbe <github@hollensbe.org> (github: erikh)
Update documentation noting that SIGCHLD is not proxied.

Docker's --sig-proxy option sends all signals but one to a container. The
exception s SIGCHLD, which is deliberately ignored as it doesn't make sense to
send such a signal to a process in a container. Documentation updates will make
this less confusing if anyone does attempt to do this.

Docker-DCO-1.1-Signed-off-by: Matt Heon <mheon@redhat.com> (github: mheon)
improve untar when using files instead of directories. Specifies behavior on non-existant targets.

Docker-DCO-1.1-Signed-off-by: Tibor Vass <teabee89@gmail.com> (github: tiborvass)
fix bug in FollowSymlinkInScope when link == root

Docker-DCO-1.1-Signed-off-by: Tibor Vass <teabee89@gmail.com> (github: tiborvass)
add integration test for --workdir=/

Docker-DCO-1.1-Signed-off-by: Tibor Vass <teabee89@gmail.com> (github: tiborvass)
Combined AddGet benchmark

Docker-DCO-1.1-Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com> (github: LK4D4)
Import public GPG key after adding the openSUSE repository

Docker-DCO-1.1-Signed-off-by: Christian Berendt <berendt@b1-systems.de> (github: berendt)
Add a step to verify if Docker is working as expected

Like in the other installation guides I added a simple test
to verify that importing images and starting containers is
working.

Docker-DCO-1.1-Signed-off-by: Christian Berendt <berendt@b1-systems.de> (github: berendt)
fix whitespace that precedes the escape in a multiline string.

Docker-DCO-1.1-Signed-off-by: Erik Hollensbe <github@hollensbe.org> (github: erikh)
Merge pull request #6666 from erikh/fix-escaping-whitespace

fix whitespace that precedes the escape in a multiline string.