Modified to fix #960

1. Formatting non-master checkboxes based on the 'select' value.
2. Making the non-master's model 'select' change silent so that it wouldn't re-render the datatable.
Modified to fix #960
#960 reverting changes as per @lsmith comments

- Reverting the formatter config back to string type.
- Added more doc for the `{ silent: true }` change.
Merge remote-tracking branch 'gurumvg/#960-problem-with-checkbox' into dt-example
Shorten explanatory comment