Make multiple imports consistent with import ( ... ) style

Fixes #272

examples/string-functions/string-functions.go

@@ -4,8 +4,10 @@
 
 package main
 
-import s "strings"
-import "fmt"
+import (
+	"fmt"
+	s "strings"
+)
 
 // We alias `fmt.Println` to a shorter name as we'll use
 // it a lot below.

examples/string-functions/string-functions.hash

@@ -1,2 +1,2 @@
-17aa523bbd606fa0b624fae44b89812d46330755
-Vn4D3y4_711
+bf39c7540bd78eba38eb5a9047a9d0ffc7235f85
+xoRUhG86wsF