v0.7.92 - Bug fixes, debug line added

[0.7.91] - Bug fixes: Fix last recorded event query for admin page. Fix
camera status icon, was using incorrect class. Now using correct font
awesome icon.
[0.7.92] - Debug: Added debug line to see how often frames are being
displayed. Need to ascertain whether poor framerate is due to zoneminder
daemon or javascript playback.