Removed line break from the message to correct ltsv format in each line

- active merchant write log including line break.
- If I use this LTSV formatter, the LTSV format corrupts.

```
time:2014-02-21 11:46:06 +0900	message:{
  "object": "customer",
  "created": 1392950729,
  "id": "cus_xxxxxxxxx",
  "livemode": false,
  "description": null,
<snip>
```