Added proposed Docker Community Guidelines

Docker-DCO-1.1-Signed-off-by: James Turnbull <james@lovedthanlost.net> (github: jamtur01)
Update nodejs_web_app.md

The image centos:centos6.4 doesn't exist. Instead you have to choose between the official centos6 or centos7. Both images does not work together with de yum npm install. When choosing an centos6.5 from another distributor (tutum) it works.
integcli: add some more docker utils

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
integcli: use dockerCmdInDir in build tests

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
Make lxc driver rbind all user specified mounts.

Docker-DCO-1.1-Signed-off-by: Vishnu Kannan <vishnuk@google.com> (github: vishh)
Add a cli integration test for recursive bind mounting.

Docker-DCO-1.1-Signed-off-by: Vishnu Kannan <vishnuk@google.com> (github: vishh)
Apply @jamtur01's copy edit's to certificates.md

Docker-DCO-1.1-Signed-off-by: Timothy <timothyhobbs@seznam.cz> (github: timthelion)
Update nodejs_web_app.md

Updated to documentation to use the centos6 image instead of the unofficial tutum image of centos6.4
Btrfs graph driver is not experimental

Btrfs graph driver is not experimental now according to #4838 and CHANGELOG.md is saying "btrfs is no longer considered experimental.".

Docker-DCO-1.1-Signed-off-by: Ken ICHIKAWA <ichikawa.ken@jp.fujitsu.com> (github: ichik1)
networking.md: Networking between containers works without ip_forward

Docker-DCO-1.1-Signed-off-by: Erik Inge Bolsø <knan@redpill-linpro.com> (github: knan-linpro)
Merge pull request #7295 from vishh/rbind

Make lxc driver rbind all user specified mounts.
Added test cases for no port passed to nat.ParsePortSpecs and negative port number passed

Docker-DCO-1.1-Signed-off-by: Rajdeep due <dua_rajdeep@yahoo.com> (github: rajdeepd)
Move "kill" to daemon/kill.go

This is part of an effort to break apart the deprecated server/ package

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)
Move "export" to daemon/export.go

This is part of an effort to break apart the deprecated server/ package

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)
Move "create" to daemon/create.go

This is part of an effort to break apart the deprecated server/ package

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)
Move "stop" to daemon/stop.go

This is part of an effort to break apart the deprecated server/ package

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)
Move "start" to daemon/start.go

This is part of an effort to break apart the deprecated server/ package

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)
Move "restart" to daemon/restart.go

This is part of an effort to break apart the deprecated server/ package

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)
Move "wait" to daemon/wait.go

This is part of an effort to break apart the deprecated server/ package

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)
Move "resize" to daemon/resize.go

This is part of an effort to break apart the deprecated server/ package

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)