Correct camel, underscore and pascal casing

[alex-ong]

At some point we should change all code to comply with PEP8.

Blake has already done a wonderful job converting lots of classes, but there is still plenty to go.

New code should comply:
function_name (all lowercase, underscores between words.)
SomeClass (PascalCase)
module_name.py (all lowercase, underscores between words)
folder (ideally one word, simple, all lowercase, otherwise add underscores)