Make package conform to python conventions

[mnunberg]

• No PascalCase/camelCase filenames. Only underscores are acceptable as word delimters in file names/package names
• Only classes should have PascalCase, no functions with PascalCase
• Use class Foo(object) and not class Foo:
• Use str.format rather than %
• Variables not intended for public use should be underscore prefixed
• No variables should have PascalCase. Ideally, no variables should even be camelCase
• Keep stuff out of init.py. __init__.py is supposed to be a "landing page" kind of module which imports other Python modules and performs some setup/sanity (which isn't needed in this package anyway), not the main module source. This was a bad practice in rmtest, but since this is a new module, let's make it good from the start.