Added a spinner component

http://www.virtuosoft.eu/code/bootstrap-touchspin/

This uses an  Apache Licencs v2.0 Licence
instead of `null` you should set the default value from the table at http://www.virtuosoft.eu/code/bootstrap-touchspin/ instead
i.e. `""` for `initval`, `0` for `min`, `100` for `max`, etc.