Merge pull request hubotio#40 from jnewland/twilio-port

use PORT env var for Twilio SMS callback URL server

src/hubot/twilio.coffee

@@ -37,7 +37,7 @@ class Twilio extends Robot
       response.writeHead 200, 'Content-Type': 'text/plain'
       response.end()
 
-    server.listen (parseInt(process.env.HUBOT_SMS_PORT) || 8080), "0.0.0.0"
+    server.listen (parseInt(process.env.PORT) || 8080), "0.0.0.0"
 
   handle: (body, from) ->
     return if body.length == 0