Some more code clean up.

This would be better if I knew more Ruby. Some clean up before I try and move all the files around to make this into a Gem.

- [x] Better names for some variables
- [x] Follow standard ruby naming conventions (CamelCase for classes, underscores for everything else.)
- [x] Remove global variables from Yasuo.rb
- [x] Remove any old / commented out code
- [x] Allow users to load the signatures file as well, since you can load everything else from the command line.
- [x] Refactor duplicated code blocks.
Array doesn't have a zero? method, need to use size or something else.