Style + version conventions

[timql]

Just to make everything more consistent as we start to push out more code, could we settle on some style conventions? Some things come to mind:

• 4 spaces for indentation
• 80 character line limit
• camel case for classes (e.g., MyClass), snake case for everything else (e.g., my_variable, my_function) (and I suppose dashes for file/directory names, like policy-smoothing).
• docstring for every function explaining at a minimum what it does, and preferably what inputs are expected, and what it returns and possibly what exceptions it raises.

Are these ok with everyone, and does anyone have any to add? We could/should eventually put these into a readme.

Also, we should also settle on what versions of things we're using. In particular, @benlawson 's amazon pricing script uses Python 3, but @ch3njust1n 's code uses Python 2. Is there a reason not to use Python 3 for everything?

[ch3njust1n]

Ok. Sounds good. No particular reason why I'm using Python 2. It's just what's on my machine. Python 3 is fine.