Raise Exec timeout

```
Thu Nov 14 18:28:58 +0100 2013 Puppet (err): Command exceeded timeout
Thu Nov 14 18:28:58 +0100 2013 /Stage[main]/Nodejs/Helper::Script[install nodejs]/Exec[exec install nodejs]/returns (err): change from notrun to 0 failed: Command exceeded timeout
```

See: https://ask.puppetlabs.com/question/1308/command-exceeded-timeout/