Engine: new command 'kill' sends a signal to a running container
Hack: use new 'kill' command in integration tests
gofmt
Engine: port 'kill' to the new integer status.
Engine: don't log job stdout to engine stdout (it might be non-text output, for example tar data for 'export'
Engine: 'export' returns a raw archive of a container's filesystem
don't open bind mounted files/dirs to get Stat, use os.Lstat
Merge pull request #3152 from daniel-garcia/3129_dont-open-bindmounted-files

don't open bind mounted files/dirs to get Stat, use os.Lstat
Merge pull request #3113 from shykes/engine-export

Move 'docker export' to the engine API
revert 'firstErr'
make docs is more consistent
Merge pull request #3159 from SvenDowideit/make-docs-consistency

Makefile: make docs is more consistent
Merge pull request #2735 from shykes/engine-job-kill

New engine command: 'kill'