The Monitor model is now smart enough to change the stream's scale.
It also has the option of not scaling at all (in the case of the
single monitor view).
No longer need LiveStreamHelper, and the logic of which image to
display (live or placeholder) has been moved to the Moniors model.
This way should be much easier to understand and support. This also
fixes my 'ugly hack' in commit eed6c81287
* Moved getStreamSrc from Monitors Controller to Monitors Model
* Minor indenting of code
* Removed some old code
* Changed how I lookup ZM_MPEG_LIVE_FORMAT from within getStreamSrc
* Changed Monitors View view to use divs instead of tables
Kyle Johnson