Issue/14

While the console is viewed, it always sends its state at SEND_DATA_INTERVAL.  It also sends its state when a a fader is moved, this is done through kivy properties, and is intended to make smoother movements of data when a fader is moved.  The console also registers to listen for the selected universe and updates the console state accordingly.  The main side effect of this simultaneous DMX sending and receiving is that LTP merging can have weird results.  That said, I'm not sure if I understand why LTP merging as it's implemented in OLA ever makes any sense.

Fixes #14 
Is this an application specific constant? It looks like its a constant to decide how many channels to control, change its name to something like _DMX_CHANNELS_TO_SHOW, etc. That way people aren't confused that is might be the maximum number of channels in a universe.