Initial chekin post-discontinuity.

TODO.md

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+* Implement text filters
+** implement abstractize number filter which will take any number as imput and return a NUMBER abstract.
+** Implement the abstractize roman numeral filter which will take a token that looks like a roman numeral (except for I) 
+   return a NUMBER abstract.
+** implement punctuation stripper / abstractizer which will take a punctuation token and return an abstract or abort the
+   token.
+** Implement asciifier token which will take a unicode string and return an ascii approximation.
+* Implement some example code.
+* Complete documentation and introductions to actually be useful to users.