The launch system no longer uses XMPP.
Remove script that only made sense in the old invsrvlauncher
Add AWS credential.
Did I say the launch system no longer uses XMPP?
Fill README to reflect projected behavior; add config.py.
Set appropriate permissions in secret files.

Git won't honor these, so we have to reset them on first usage.
Big simplifying refactoring (untested).

README-driven development gone a bit out of hand.  Committing when things look basically OK, not to make this huge commit even bigger and less meaningful.  Sorry about that.
Rename launching script.
Misc uninteresting little fixes.

Basically, whatever it took for the salt config to run (with some nontrivial errors).