Ignore eggssess.
Turn _CreateSensors into a @classmethod

This is just a stylistic change.. it doesn't do much of anything else.
I learned to do things this way at PyCon in Alex M's talk on python
APIs.  He pointed to how the stdlib does things this way often, like
datetime.datetime.fromtimestamp and datetime.datetime.fromXXX.

Using classmethods like this is kind of like a way to give your
classes multiple kinds of constructors.
Merge pull request #1 from ralphbean/random

Some random stuff