[Feature Request] Allow delegation of UITableViewDataSource methods

[pulkitsinghal]

It would be great if the out-of-box CouchUITableSource would use the [self tellDelegate: @selector(... convention with methods of UITableViewDataSource such as tableView:canEditRowAtIndexPath:

For example, currently we have:

- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {
    return _deletionAllowed;
}

This doesn't allow us to do clever things such as mixin our own conditions for which rows can be deleted and which cannot.