Update to Swift 2.0 .

Wow, lots of changes in Swift 2.0! And all of them great, except for renaming println to print. What's up with that?
This is just to get it to compile, we will be trying and throwing errors in no time.

SwiftShellTests/Scripts/print_arguments.swift

@@ -2,4 +2,4 @@
 
 import SwiftShell
 
-println(Process.arguments)
+print(Process.arguments)

SwiftShellTests/Scripts/readfilelinebyline.swift

@@ -4,5 +4,5 @@ import SwiftShell
 
 for line in open("onetwothree.txt").lines() {
 	// Do something with each line
-	println(line)
+	print(line)
 }