Bring BVReorderTableView to Xcode 6+ and iOS7/iOS8 standards

[SwiftArchitect]

[SwiftArchitect]

This goes hand-in-hand with StackOverflow question UITableView tap and hold + drag and drop for which BVReorderTableView is an elegant solution.

[thejeff77]

@bvogelzang What would you think about reviewing/merging some of these pull requests? Lots of work has gone into your library.