rough concept: detect pipe when calling job:show command

This concept improves `td job:result` comand when playing query with small set of result.
In most cases, Hive's `ORDER BY` takes 30 ~ 40 seconds as itself's initialization costs.
so I'd like to sort the result on local machine. for examples:

````
td job:show 123456 | sort -k 1 -k 2 -n
````

Unfortunately, my ruby skill is really poor. so could you consider this concept at first?

Thanks,
Shuhei