Convert Bool to Data and back

Bool+Data.swift

extension Bool {

	var data:NSData {
		var _self = self
		return NSData(bytes: &_self, length: MemoryLayout.size(ofValue: self))
	}

	init?(data:NSData) {
		guard data.length == 1 else { return nil }
		var value = false
		data.getBytes(&value, length: MemoryLayout<Bool>.size)
		self = value
	}
}