Use "|> write(standardoutput)" instead of " |> standardoutput". And support writing of sequences of strings.

Avoids the special case of "|> WriteableStreamType".

SwiftShellTests/Scripts/callswiftscriptfromswift.swift

@@ -2,4 +2,4 @@
 
 import SwiftShell
 
-run("./listallexecutablesinpath.swift") |> run("./print_linenumbers.swift") |> standardoutput 
+run("./listallexecutablesinpath.swift") |> run("./print_linenumbers.swift") |> write(standardoutput) 

SwiftShellTests/Scripts/listallexecutablesinpath.swift

@@ -6,10 +6,10 @@ import SwiftShell
 let directories = environment["PATH"]!.split(":")
 
 for directory in directories {
-	run("find \"\(directory)\" -type f -perm +ugo+x -print") |> standardoutput
+	run("find \"\(directory)\" -type f -perm +ugo+x -print") |> write(standardoutput)
 }
 */
 
 environment["PATH"]! |> split(":") 
 	|> map { directory in run("find \"\(directory)\" -type f -perm +ugo+x -print") } 
-	|> standardoutput
+	|> write(standardoutput)

SwiftShellTests/Scripts/print_linenumbers.swift

@@ -2,9 +2,13 @@
 
 import SwiftShell
 
+/*
 var i = 1
 for line in standardinput.lines() {
 	print("line \(i++): ")
 	println(line)
 }
+*/
 
+var i = 1
+standardinput.lines() |> map {line in "line \(i++): \(line)\n"} |> write(standardoutput)

SwiftShellTests/Scripts/stream_out.swift

@@ -2,5 +2,5 @@
 
 import SwiftShell
 
-run("echo this is streamed") |> run("wc -w") |> standardoutput 
+run("echo this is streamed") |> run("wc -w") |> write(standardoutput)