Add ability to force removal of running container via docker rm -f

Docker-DCO-1.1-Signed-off-by: Brian Goff <cpuguy83@gmail.com> (github: cpuguy83)
Return correct process pid for lxc

Fixes #2875
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Added Docker-PHP to the list of client libs

Docker-DCO-1.1-Signed-off-by: Geoffrey Bachelet <geoffrey.bachelet@gmail.com> (github: ubermuda)
Merge pull request #3959 from cpuguy83/3958_add_ability_to_remove_running_container_in_single_command

Add ability to force removal of running container via docker rm -f
Merge pull request #4488 from crosbymichael/return-correct-lxc-pid

Return correct process pid for lxc
Fix name parameter

Docker-DCO-1.1-Signed-off-by: Victor Vieux <victor.vieux@docker.com> (github: vieux)
Merge pull request #4475 from ubermuda/patch-1

Added Docker-PHP to the list of client libs
Merge pull request #4510 from vieux/fix_param_doc

Fix name parameter
Remove the ghosts and kill everything
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Merge pull request #4509 from crosbymichael/kill-all

Remove the ghosts and kill everything