Run /opt/shutdown.sh from init's rc.shutdown

Modify /etc/init.d/rc.shutdown during iso build to call /opt/shutdown.sh
first.  This ensures /opt/shutdown.sh runs when user executes
/sbin/poweroff or /sbin/reboot.

Signed-off-by: Justin Charette <charetjc@gmail.com>
Replace exitcheck.sh with poweroff in ACPI power event

If exitcheck.sh is left in ACPI, then the /opt/shutdown.sh will run
twice; Once from exitcheck.sh, and again from /etc/init.d/rc.shutdown.

Signed-off-by: Justin Charette <charetjc@gmail.com>
Inform user when shutdown script runs during init shutdown/reboot

Signed-off-by: Justin Charette <charetjc@gmail.com>
Use -- instead of - in favor of consistent go style
Merge pull request #293 from boxofrox/fix/call-opt-shutdown-script-from-init

Fix/call opt shutdown script from init
Merge pull request #294 from jayzeng/master

Use -- instead of - in favor of consistent go style
docker build --rm is now default
Merge pull request #295 from SvenDowideit/build-rm-now-default

docker build --rm is now default
new release with Docker 0.9.1 - will trigger trusted build
Merge pull request #296 from SvenDowideit/0-7-1-release

new release with Docker 0.9.1 - will trigger trusted build