Fix comments in spec; line comments > block comments
Add spec for unicode ellipses as terminal marker
Add functionality for unicode ellipses as sentence terminal marker
Add spec for functionality to deny comma as first token in sentence

This should work, but as described in issue 15, currently does not.
Add functionality for denying a comma as first token in sentence (closes #15)

- Move mergePrefixExceptions and mergeAffixExceptions later in
  the modifier queue;
- Fix dumb single- and double quotes to be included in the
  previous sentence, by adding these marks to
  EXPRESSION_AFFIX_PUNCTUATION.