A number of fixes in sandbox and declaration processing

lib/extension-wrapper.coffee

@@ -21,7 +21,6 @@ script = require("#{process.argv[2]}/#{process.argv[3]}")
 
 process.on('message', (message) ->
   script[message[1][0]](message[1].slice(1), (err, res) ->
-    throw err if err
-    process.send([message[0], res])
+    process.send([message[0], err, res])
   )
 )