fix Elasticsearch 1.2.1 log path parsing

hello

I noticed I couldn't find the logs after installing Elasticsearch 1.2.1  This fixes the parsing in config.  Please review.  Thank you.

[1.2.1 config file (github)](https://github.com/elasticsearch/elasticsearch/blob/6c95b759f9e7ef0f8e17f77d850da43ce8a4b364/config/elasticsearch.yml#L155-L167)
hello.  I had this issue during the default install (I didn't modify the config).

It looks like the [1.2.1 config comment](https://github.com/elasticsearch/elasticsearch/blob/6c95b759f9e7ef0f8e17f77d850da43ce8a4b364/config/elasticsearch.yml#L163) might have changed to `#path.logs` from `# path.logs`

I was expecting to find the logs under `/usr/local/var/log/elasticsearch/elasticsearch_mc.log` per `brew info elasticsearch` below:
```
➜  ~  brew info elasticsearch
elasticsearch: stable 1.2.1, HEAD
http://www.elasticsearch.org
/usr/local/Cellar/elasticsearch/1.2.1 (37 files, 21M) *
  Built from source
From: https://github.com/Homebrew/homebrew/blob/master/Library/Formula/elasticsearch.rb
==> Caveats
Data:    /usr/local/var/elasticsearch/elasticsearch_mc/
Logs:    /usr/local/var/log/elasticsearch/elasticsearch_mc.log
Plugins: /usr/local/var/lib/elasticsearch/plugins/
```

Instead, it looks like it was logging to `/usr/local/Cellar/elasticsearch/1.2.1/logs/` for me.  Just wanted to bring up the discrepancy :)