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Wraps console.log to include a timestamp (in seconds since the wrapper was initialized) with every log message.
console.log = (function() {
var console_log = console.log;
var timeStart = new Date().getTime();
return function() {
var delta = new Date().getTime() - timeStart;
var args = [];
args.push((delta / 1000).toFixed(2) + ':');
for(var i = 0; i < arguments.length; i++) {
console_log.apply(console, args);
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