Preserve capitalization of words

[talk2MeGooseman]

Right now the entire string is being downcased and parsed to match against the dictionary of words. This helps with matching but the resulting output can remove important capitalization of words (ie NASA, FBI) and might result in confusing sentences.

Example of checking:

        capitalized = (word.slice(0,1) == word.slice(0,1).upcase)
        fully_capitalized = (word == word.upcase)