Mainly copyedits, but also - Dart .jade extends TS .jade file with minor overrides - Significant update of example code (so it matches the ts example in its appearance and behavior). - Tweaks to Dart code. - A few extra/corrected mixin definitions in `_util-fns.jade`.
Why the _fragments dir is checked in
Within this repo files generated as a result of shredding the _examples dir ( the contents of the _fragments dir) are checked in so that we can avoid running the
shredder over the entire _examples dir each time someone refreshes the repo ( the shred-full gulp task).
The gulp serve-and-watch shredder is only a ‘partial’ shredder. It only shred’s files in directories changed during
the current session.