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Typecasting now includes as!

Available from Swift 1.2

Paul Hudson      @twostraws

From Swift 1.2 onwards we have three ways of performing typecasts: as is used for typecasts that will always succeed (e.g. someString as NSString), as? is used for typecasts that might fail (e.g. someView as? UIImageView), and as! is used to force typecasts. If you use as! and you're wrong, your code will crash.

For example:

let submitButton = vw.viewWithTag(10) as! UIButton
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