Build formula name from method_missing param

Correct class names to better match Ruby style, then take advantage of that fact to build the formula class's name from the method_missing name parameter.

I think this makes things a little cleaner, plus I was able to remove the self.shortcut methods from the Odyssey class.

I updated the minor version, since this would break anyone relying on those removed shortcut methods.

Let me know what you think!