inputClass does nothing in current build 1.3.0

I was looking for a way to style the Add/Edit/Delete links to conform with Bootstrap 4, and noticed there is mixed support in the settings file per the documentation. However, upon trying it out, it did not work.

I looked into the following file and noticed there is nothing bound to [ngClass]:
`ng2-smart-table/src/ng2-smart-table/components/tbody/cells/edit-delete.component.ts
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nor are there any class variables pertaining to these options, as well as anything in ngOnChanges() to read from the settings.

The same goes for the add button here:
`ng2-smart-table/src/ng2-smart-table/components/thead/cells/add-button.component.ts`

Seems like these features were documented without being implemented. I have my own fix for it at the moment but please remedy this for future builds. Thanks