Add support for disabling / enabling a cell.

[animaonline]

For example a BOButtonTableViewCell that is used to initiate an IAP.

[davdroman]

That's a good one, although I don't think the current API is flexible enough to offer this kind of feature, as it'd be necessary to do some code duplication from chunks like this to achieve that effect.

That's why I propose to move this feature to the 4.0.0 milestone and discuss further detail implementations in #33. I can easily think of a neat enum-based implementation for hidden, enabled and some more states depending on a certain setting value.