Duplicate events when using -e and CR before output parentesis

```
abonuccelli@w530 /opt/elk/TEST/logstash-1.4.2/bin $ ./logstash -e '
input{stdin{}}filter{}output{stdout{codec=>rubydebug}}'
oneevent
{
"message" => "oneevent",
"@version" => "1",
"@timestamp" => "2015-03-02T09:53:35.873Z",
"host" => "w530"
}
abonuccelli@w530 /opt/elk/TEST/logstash-1.4.2/bin $ ./logstash -e '
input{stdin{}}filter{}output
{stdout{codec=>rubydebug}}'
onevent
{
"message" => "onevent",
"@version" => "1",
"@timestamp" => "2015-03-02T09:53:48.442Z",
"host" =&g
t; "w530"
}
{
"message" => "onevent",
"@version" => "1",
"@timestamp" => "2015-03-02T09:53:48.442Z",
"host" => "w530"
}
```

seen on 1.5.0 too by @jsvd