Fix JS content type not being set on set.js route

This was breaking the Mastodon client-side updates example
in latest Safari with x-content-type-options: nosniff on.

coffee/routes/set.js.coffee

 ################################################################################
 #
-# Set 
+# Set
 #
-# Copyright © Aral Balkan. 
-# Released with ♥ by Ind.ie under the MIT License. 
+# Copyright © Aral Balkan.
+# Released with ♥ by Ind.ie under the MIT License.
 # Portions released under the Apache License.
 #
 ################################################################################
@@ -18,4 +18,5 @@ exports.route = (request, response) ->
 			response.send '<h1>Error 404: Could not find set.js</h1>'
 		else
 			response.status 200
+			response.type 'js'
 			response.end data

coffee/server.coffee

@@ -4,8 +4,8 @@
 #
 # The server for the Set examples.
 #
-# Copyright © Aral Balkan. 
-# Released with ♥ by Ind.ie under the MIT License. 
+# Copyright © Aral Balkan.
+# Released with ♥ by Ind.ie under the MIT License.
 # Portions released under the Apache License.
 #
 ################################################################################
@@ -63,5 +63,3 @@ createRoute '/set.js'
 app.listen (process.env.PORT || 3000)
 
 console.log '\nServer running… visit http://localhost:3000/ to play with the Set examples.\n'
-
-