docker.upstart: avoid spawning a `sh` process

start script / end script create an intermediate sh process.
docker.upstart: use the same start/stop events as sshd

Is probably more solid
add ps args to docker top
bump api version to 1.4
Merge branch 'master' into 1237-improve_docker_top-feature

Conflicts:
	docs/sources/api/docker_remote_api.rst
ensure mount in commit
add regression test + go fmt
Fixes 1136; Reopened from 1175 with latest changes.
fix wrong untag when using rmi via id
fix docs
add regression test
Bind daemon to 0.0.0.0 in Vagrant. Fixes #1304
Remove unnecessary signal conditional.
Keep the loop to allow resizing more than once.
Refactor checksum
Handle extra-paremeter within checksum calculations
Refactor the image size storage
Remove unused parameter
Switch json/payload order
Make sure the index also receives the checksums