Python 3 compatibility
Use YAML config instead of weird Python dict
Some PEP8 action on mime multipart script
Added requirements.txt
Make gen-user-data script more usable
Removed useless options

Port numbers, as well as ssl.conf file
Several fixes in install process

As well as some comments to make it clearer
Use nohup on indico_scheduler

So that it stays daemonized
Updated README

Explanation of cloud-init usage and server management