Option to log Terminal and Notebooks

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Hi,

I need to implement Terminal and Notebook logging.

How I see it:

1. Add options in `jupyter_notebook_config.py` such as:
* log_terminal: bool (weither we log the terminals)
* log_notebook: bool (weither we log the notebooks)
* log_terminal_file: Unicode string (if log_terminal is true, specify where to write logs)
* log_notebook_file: Unicode string (if log_notebook is true, specify where to write logs)

2. Log messages in "on_message" and "write_message" in https://github.com/jupyter/notebook/blob/master/notebook/terminal/handlers.py
3. Log messages in "on_message" and "write_message" in https://github.com/jupyter/notebook/blob/master/notebook/services/kernels/handlers.py

I would like to do a Pull/Request for that, could you please tell me if what I suggest is fine.
How can I specify new options for jupyter_notebook_config.py?

Thank you,
Julien

Start by reviewing jupyter_notebook_config.py and the on_message and write_message entry points in notebook/terminal/handlers.py and notebook/services/kernels/handlers.py. Confirm how new configuration options are defined and determine the expected log destinations and message coverage. Done means terminal and notebook logging can each be enabled and directed to their configured files.

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