[SPARK-4017] show progress bar in console and title

The progress bar will look like this:

![1___spark_job__85_250_finished__4_are_running___java_](https://cloud.githubusercontent.com/assets/40902/4854813/a02f44ac-6099-11e4-9060-7c73a73151d6.png)

In the right corner, the numbers are: finished tasks, running tasks, total tasks, and used time since beginning.

After the stage has finished, it will show a line of summary for it.

Also, the status will be showed in the title of console.

The progress bar is only showed if logging level is WARN or higher (but progress in title is still showed), it can be turned off by spark.driver.showConsoleProgress.


Either stdout or stderr could be redirect to somewhere, but console is the real target.

If last log line ws print, it will overwrite it. In most cases, logging will be writted as println.