a node cluster helper

###Usage typical server.js:

var klusterize = require('klusterize');

klusterize({
	worker: function() {
	    console.log('I am a worker');
	},
	master: function() {
		console.log('I am the master');
	},
	reforkOnDeath: false,
	workersToCoresRatio: 0.5
});

//on a 4 cores system will (eventually) print 'I am a worker' twice and 'I am the master' once

Same as the above only this time called directly:

var klusterize = require('klusterize');

klusterize(
	function() {
	    console.log('I am a worker');
	}, 
	function() {
		console.log('I am the master');
	},
	false,
	0.5);

files instead of functions:

var klusterize = require('klusterize');

klusterize({
	worker: 'worker.js',
	master: 'master.js'
});

• worker - required, a function to invoke on worker processes or a name of a javascript filename

• master - optional, will be fired after forking code, can be a function or a javascript filename

• reforkOnDeath - optional, whether to refork processes when a worker dies, defaults to true

• workersToCoresRatio - optional, workers to cores ratio expressed in numerical notation (i.e 0.5 = 50% of the cores etc.), default is 1 (100%). In any case there will always be a minimum of one worker. Values over 100% are acceptable and will spawn more workers than cores. The calculation will round the result down (i.e on a system with 5 cores, 0.5 will be rounded down to 2)

• workersCount - optional, en explicit number of worker to start, this will override workersToCoresRatio. as with workerstoCoresRation a minumum of 1 worker is enforced.

• workerDeathCallback - optional, a callback to invoke on worker death. specifying this param will override reforkOnDeath behavior.

• env - optional, environment of the worker

###TODO expand tests