Range rendition of `splitEvery` in Swift 2

gistfile1.swift

extension Range {
    
    /// Split range into an array of ranges of predetermined size.
    ///
    /// Adapted from http://stackoverflow.com/a/26691258/1271826
    ///
    /// - parameter every:   How many items per subrange
    /// - returns:           An array of Range objects
    
    func splitEvery(every: Element.Distance) -> [Range] {
        var result = [Range]()
        var from = startIndex
        
        while from != endIndex {
            let to = from.advancedBy(every, limit: endIndex)
            result.append(from ..< to)
            from = to
        }
        return result
    }
    
}

This is a follow-up to Martin's post.