Multi-project architecture, LetsEncrypt, Creator, nginx separation, simplification

[niieani]

Hello @erroneousboat,

I found your project to be a good base for a proper, production-ready docker-compose django setup.
I've made some changes to it - hopefully you'll see them as improvements. If you find they make sense to you, feel free to pull this.

• separated nginx into its own service
• the above removed the need for init-based containers, and ssh - everything simplified
• made use of latest docker-compose 1.5 features that makes it possible build on top of existing .yml's
• implemented automated LetsEncrypt for hassle-free valid and free SSL certificates (will work from November 16, 2015)
• project-independent architecture - multiple projects can be started with the same docker images (pip install on first run instead of in-image)
• this also means you don't need to clone this project for every new Django project, making it more maintainable
• added a project configuration creator (./create) - generates .yml override files
• added an alias for issuing commands relevant to a specific project (./compose PROJECT_NAME)
• removed the need for the heavy template binary, opting to use sed instead
• updated readme