PR tweaks
Pickett docker devices support (WIP)
Support for priviledged
Merge branch 'devices' of github.com:tcolar/pickett into tcolar-devices

Conflicts:
	conf.go
	io/docker.go
	topo_runner.go
Merge branch 'tcolar-devices'
safety
Updated commands to understand etcd.

This commands have slightly different semantics than the original versions.

build -> build
run -> run
stop -> stop
drop -> stop + remove entry in etcd
wipe -> remove all tags

To get the previous behavior of wipe you have to do drop first, then wipe.
Merge pull request #45 from iansmith/improved_commands

Improved commands
Basic step implemented
Env: wip