Add `prepare()`,`run_server()` and `migrate_db()` to `fabfiles/development.py`.
Fixed typo in `urls.py`
Give default value for `STATIC_ROOT`.
Use `valid_static_root()` instead of `check_static_root()` and modified `build_static()`.
Add @task decorator to `migrate_db()`.
Modified `html5admin_form.less`.
Modified `demo_form.html`.
Modified template wording.