Modularized script definitions.
Scripts can now be in submodules. So, scripts like gonzo.scripts.instance.launch can now be used with instance-launch. Similarly for stack-launch
Created list/show/terminate scripts for stacks. Currently only working for OpenStack
Cleaned up an unused import
Refactored BotoCfn out to a seperate extension of the base stack class. This allows all the botocfn to be in one place but be used by openstack and aws