Allow non-local access to grunt connect server

If you're testing your changes on other machines, it's handy to be able to use the connect task. Modified the config so connect will listen for non-local connections.

@@ -74,6 +74,7 @@ module.exports = function(grunt) {
     connect: {
       dev: {
         options: {
+          hostname: '*',
           port: 9999,
           keepalive: true
         }