Squelch debug logging in GUI

[bodom0015]

The frontend logs are currently fairly noisy. Since we are using AngularJS's $log service, this should be fairly simple, and can be accomplished by calling the following during app.config():

$logProvider.debugEnabled(false);

This will prevent $log from propagating $log.debug() events, and should only show the other levels of log activity. Furthermore, the start.sh -d command could substitute true (via sed), to allow you to see the debug output when starting in "developer mode".

[craig-willis]

Reviewed changes