A simple subscript to allow python-like string slicing.

slice.swift

// Example: mystring[0] or mystring[2,6]

import Cocoa

extension String {
	subscript(index:Int) -> Character {
		get {
			return Character(bridgeToObjectiveC().substringWithRange(NSMakeRange(index,1)))
		}
	}
	subscript(start:Int, end:Int) -> String {
		get {
			return String(bridgeToObjectiveC().substringWithRange(NSMakeRange(start, end-start)))
		}
	}
}