Add post ece command hook

[thovel]

It is often needed to automate stuff that happens after the ece script runs. Lets agree on where to put the post command scripts and execute them automatically

We already have:
/usr/share/escenic/ece-scripts/ece.d/ : assemble.sh clean.sh flush.sh info.sh logs.sh publication-resources.sh restart.sh stop.sh top.sh backup.sh deploy.sh help.sh kill.sh package.sh remove-old-log-files.sh start.sh thread-dump.sh versions.sh

what about this:
/usr/share/escenic/ece-scripts/pre-ece.d/deploy/ : 01-schedule-downtime.sh 02-hipchat-start.sh 03-shutdown-varnish.sh
/usr/share/escenic/ece-scripts/post-ece.d/deploy/ : 01-run-bootstrapper.sh 02-start-varnish.sh 03-hipchat-done.sh

or
/usr/share/escenic/ece-scripts/deploy/pre.d/ : 01-schedule-downtime.sh 02-hipchat-start.sh 03-shutdown-varnish.sh
/usr/share/escenic/ece-scripts/deploy/post.d/ : 01-run-bootstrapper.sh 02-start-varnish.sh 03-hipchat-done.sh