Fix SWF downloading for HTTPS URLs

TNT started using HTTPS URLs! And our old Ruby version (lol 😬) still requires explicit invocation to perform SSL during a request, so requests were failing!

Now, we explicitly build the `Net::HTTPS` object, and turn on `use_ssl` if it's an HTTPS URL! (The shorthand invocation didn't seem to have an option for this, that I could find!)

app/models/swf_asset.rb

@@ -262,7 +262,9 @@ class SwfAsset < ActiveRecord::Base
   before_create do
     uri = URI.parse url
     begin
-      response = Net::HTTP.get_response(uri)
+      http = Net::HTTP.new(uri.host, uri.port)
+      http.use_ssl = (uri.scheme == 'https')
+      response = http.get(uri.request_uri)
     rescue Exception => e
       raise DownloadError, e.message
     end