Add a default_proc assignment for versions of Ruby that don't have it
Add category stats and clean up some spacing
Refactor loading from YAML string and file
Refactor to reduce extra calls to total_examples() and calculations of the uniform category probability
Break out normalization into its own method; add a comment to keep me from geting confused
Refactor vocab Hash into its own class
Refactor data from a Hash into its own class; get rid of default_proc entirely; fixup a couple of specs that were diving directly into data
Merge branch 'master' into classerate
Merge pull request #4 from erebor/classerate

Refactor Vocab and Data into classes