Improve get_status

I imploved `get_status` method.

### Interface 

* Not Changed

### Changed

* Don't return following keys in standalone mode
  * interval_sec
  * interval_count
  * zk
  * use_cht (Converted to string like `true` or `false`)
* Add following keys
  * Key: type, Value: machine laerning type (e.g. `classifier`, `anomaly` ...)
  * Key: loglevel, Value: Command-line argument or default value (Converted to string like `INFO`, `FATAL` ...)
  * Key: logdir, Value: Command-line argument or `/dev/stderr` (It's default value)
  * Key: configpath, Value:
    * Standalone Mode: Command-line argument
    * Distributed Mode: Node path in zookeeper
  * Key: clock_time, Value: System clock time when receiving a request
  * Key: uptime, Value: How long the process has been running (sec)
  * Key: start_time, Value: System clock time when process started
  * Key: pid, Value: Process ID
  * Key: user, Value: User ID who started process
  * Key: last_saved, Value: System clock time when saved model file at last
  * Key: last_saved_path, Value: Model file path which was saved at last
  * Key: last_loaded, Value: System clock time when loaded model file at last
  * Key: last_saved_path, Value: Model file path which was loaded at last
  * Followings are returned only in distributed mode
    * Key: name, Value: Command-line argument
    * Key: zookeeper_timeout, Value: Command-line argument or default valu
    * Key: interconnect_timeout, Value: Command-line argument or default valu
    * Key: connected_zookeeper, Value: Host and Port of zookeeper that process connected (e.g. `127.0.0.1_2181`)
    * Key: join, Value: Command-line argument or default value (Converted to string like `true` or `false`)
    * Key: mixer, Value: Command-line argument or default value
    * Status of mixer

### example

In python, output of `pprint` is followings:
* https://gist.github.com/rimms/8434705

### TBD (I will create new issues)

* I want to change values of `xxxpath` to full-path.
* We should reconsider about status of storages.