Merge pull request #2577 from dotcloud/bump_v0.6.6

Bump v0.6.6
- Fix the attach examples according to the new attach behavior
- Add the option of adding the user to docker's group and avoid the usage of "sudo" before each command
- Included the sudo alternative as an example_header
skip the volumes mounted when deleting the volumes of container.
use Binds key in hostConfig to detect volumes mounted from external.
Minor code simplification for Containers api
Merge branch 'fix_examples_use_docs' of git://github.com/rogaha/docker into test-2592
Fix typos, add links, streamline content of #2592
Fix tmp dir never cleanup
Fixes #2701. Adds security section.
Fix images not being properly tagged
Vagrantfile modified to support VBoxGuestAdditions_4.3.2
Merge pull request #2732 from jplock/patch-2

Fix images not being properly tagged in mkimage-debootstrap.sh
Tiny typo cleanup
Update to go1.2rc5
test: put each arg in a separate string

Each arg to docker run should be placed in a separate string.
Otherwise, when starting the command via exec.Cmd, the command is
interpreted as "echo test", which can't be found.
test: fix TestCreateStartRestartStopStartKillRm

cat needs stdin opened, otherwise it dies immediately.
test: skip TestCreate on Fedora due to lxc utils bug

In the dind environment running on a Fedora host, the lxc utils get
confused by the /sys/fs/cgroup/cpuacct,cpu cgroup mount and lxc-start
fails trying to access the wrong cgroup directory.
test: 2 second timeout (not 2000)
fix container restart race condition

Finish container cleanup before setting the state to stopped.
Otherwise, for an application that exits quickly, a call to Restart
can allow Start to be called again before cleanup is done, resulting in
overritten data in the Container struct.