Add support for than app.py

The initial version of this framework only has support for an app.py file. I always envisioned being able to support more than this, while still trying to keep things small. What I had in mind:

• You can either have a single app.py or, create an app/ directory.
• The app/ directory must be a python package (__init__.py).
• You still have to have an app object defined in __init__.py.
• Everything in app/ will be included in the zip file distribution, including non python files.

This will allow you to split your app into multiple python modules as well as include data/config files with your app.

Keep in mind, the source code analyzer will likely need to be updated as well to handle more than just an app.py file.

[dkotik]

Please, please make this work!

[boosh]

@jamesls Any progress on allowing routes to be in more than just app.py? It’d be super useful for larger projects.