Safely dequeue any `UITableViewCell`'s subclass instance with assumption that .xib name is the same as subclass name.

UITableView_universalDequeue.swift

extension UITableView {

    public func dequeueReusableCell<T:UITableViewCell>(type: T.Type) -> T {
        let tableCell       : T
        let cellIdentifier  = String(T)

        if let cell = self.dequeueReusableCellWithIdentifier(cellIdentifier) as? T {
            tableCell = cell
        } else if let _ = NSBundle(forClass: T.classForCoder()).pathForResource(cellIdentifier, ofType:"nib") {
            self.registerNib(UINib(nibName: cellIdentifier, bundle: nil), forCellReuseIdentifier: cellIdentifier)
            if let cell = NSBundle(forClass: T.classForCoder()).loadNibNamed(cellIdentifier, owner: nil, options: nil)[0] as? T {
                tableCell = cell
            } else {
                //if anyone had better suggestion for fallback, you're welcome to comment
                tableCell = T(style: .Default, reuseIdentifier: cellIdentifier)
            }
        } else {
            tableCell = T(style: .Default, reuseIdentifier: cellIdentifier)
        }
        return tableCell
    }
}