Update allow rules to follow original conventions but ensure casing

src/lib/Ports.coffee

@@ -20,7 +20,7 @@ class Ports extends EventEmitter
     if name is 'add' or name is 'remove'
       throw new Error 'Add and remove are restricted port names'
 
-    unless name.match /^[a-z0-9_\.]+$/
+    unless name.match /^[a-z0-9_\.\/]+$/
       throw new Error "Port names can only contain lowercase alphanumeric characters and underscores. '#{name}' not allowed"
 
     # Remove previous implementation