app_terminal.py:  Added the ability to set a default encoding (changes to TerminalApplication.new_terminal() and new_multiplex()).  You can set this by adding a "default_encoding" value to 50terminal.conf (e.g. {"*": {"terminal": {"default_encoding": "cp437"}}}).
terminal.js:  Fixed a bug where the 'terminal:encoding' WebSocket action was not working.
termio.py:  A few docstring updates.