JS error logger

[pandmitr]

By pandmitr

[Manriel]

This solution does not log javascript call stack trace, that logged by console.log() function.
That means we going to get minimized part of jQuery library when occurring an error into event-callback, like this:
$('selector').on('event', function(event) { errorcode(); })

[Manriel]

Also we need a feature, that stops logging. This will prevent the uncontrolled growth of the log file on a production systems.
But the best thing is backwards: the flag, which turn this logging to on, if it's necessary.
I think, it may be the "DEBUG=true" cookie, that already used to show debug log by dbg() function now.