6751f779d0
closes #1369 Add `--lang` option whose values are any combo of `(ts|js|dart)` default is `(ts|js)` `--lang=all` runs all language tests;
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.