Pwh/st2cd

New additions
* add apt repo
* get apt repo gpg key
* run an st2 action remotely
* modified version of the st2_deploy.sh script to use the apt repo
* workflows for deployment and upgrade of st2
I'm actually going to rewrite this to be a python script that uses the st2client library.  I realized that this action will always succeed unless the API call itself fails.  What I really want to know is if the action succeeded.