function inParallel(queue, cb) {
		var count = 0, num = queue.length, cbArgs = new Array(num);

		each(queue, function(fn, i) {
			fn(function(error) {
				if (error) {
					return cb(error);
				}
				
				var args = [].slice.call(arguments);
				args.shift(); // strip error - undefined or not

				cbArgs[i] = args;
				count++;

				if (count === num) {
					cbArgs.unshift(null);
					cb.apply(this, cbArgs);
				} 
			});
		});
	}
Recieve an array of functions (usually async) to call in parallel, each  function
	receives a callback as first argument that it should call, when it completes. After 
	everything is complete, main callback is called. Passing truthy value to the
	callback as a first argument will interrupt the process and invoke main callback
	immediately.

	@method inParallel
	@static
	@param {Array} queue Array of functions to call in sequence
	@param {Function} cb Main callback that is called in the end, or in case of erro