termio.py:  Added MultiplexPOSIXIOLoop.read_raw() which does the same thing as read() except it doesn't bother to send the captured output through the terminal emulator.
app_terminal.py:  Fixed a few locations where I missed prefixing a WebSocket action with 'terminal:'
gateone.py:  Improved handling of missing dependencies; a much more user friendly message will be displayed.
gateone.js:  Fixed a bug in GateOne.Net.onOpen() where it was sending "go:get_bell" when it should have been sending "terminal:get_bell".