Created by: portnov
- Move to generators_extended
- Change name to more descriptive "Mesh Expression"
- Add small feature: default values for variables can be now specified in JSON
- Store json formatted as-is in gist. This will break compatibility with existing gists, but I believe there are not so many of them yet.
- JSON without variables is working too now.
- Update inputs when textfile is selected.
- Add documentation.