Move ssh config from bootlocal to bootsync
Use boot2docker.iso which has nsenter
Add docker-attach script for nsenter
Add more error handling and refactoring
Link docker-enter as well

docker-attach may be replaced with using nsinit
Fix an error on building a box

- rm: can't remove '/var/lib/docker/aufs': Device or resource busy
- rm: can't remove '/var/lib/docker': Directory not empty
Correct the default command
Fix a bug in the docker-attach and rename it docker-enter
Revise tests for docker-enter
Print usage to the stderr and exit 1
Remove duplicated echo
Use docker-nsenter for docker-enter
Drop the old port 4243
Upgrade boot2docker to version 1.1.0
Upgrade to 1.1
Merge remote-tracking branch 'upstream/classic' into classic

Conflicts:
	Makefile
	template.json